refactor: use trailing return types

55 files changed, 169 insertions, 171 deletions

diff --git a/.clang-tidy b/.clang-tidy
index 6fffdc8..5406dd0 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -11,8 +11,6 @@ Checks: '
   -bugprone-lambda-function-name,
   -bugprone-reserved-identifier,
   -google-readability-braces-around-statements,
-  -modernize-return-braced-init-list,
-  -modernize-use-trailing-return-type,
   -misc-non-private-member-variables-in-classes'
 WarningsAsErrors: '*'
 HeaderFilterRegex: '\/src\/'
diff --git a/src/DI/auto_wirable.hpp b/src/DI/auto_wirable.hpp
index 178158a..54a291e 100644
--- a/src/DI/auto_wirable.hpp
+++ b/src/DI/auto_wirable.hpp
@@ -8,14 +8,14 @@ template <class Interface>
 class IAutoWirable
 {
 public:
-	static Interface resolve() noexcept;
+	static auto resolve() noexcept -> Interface;
 };
 
 template <class Interface, class ObjectImpl, class... Dependencies>
 class AutoWirable : public IAutoWirable<Interface>
 {
 public:
-	static std::shared_ptr<Interface> resolve(const Container &container) noexcept;
+	static auto resolve(const Container &container) noexcept -> std::shared_ptr<Interface>;
 };
 
 #include "auto_wirable.tpp"
diff --git a/src/DI/auto_wirable.tpp b/src/DI/auto_wirable.tpp
index a99d82b..3b42cc4 100644
--- a/src/DI/auto_wirable.tpp
+++ b/src/DI/auto_wirable.tpp
@@ -3,8 +3,8 @@
 #include "auto_wirable.hpp"
 
 template <class Interface, class ObjectImpl, class... Dependencies>
-std::shared_ptr<Interface> AutoWirable<Interface, ObjectImpl, Dependencies...>::resolve(
-	const Container &container) noexcept
+auto AutoWirable<Interface, ObjectImpl, Dependencies...>::resolve(
+	const Container &container) noexcept -> std::shared_ptr<Interface>
 {
 	return std::make_shared<ObjectImpl>(container.get<Dependencies>()...);
 }
diff --git a/src/DI/container.hpp b/src/DI/container.hpp
index 2efb265..83f24ae 100644
--- a/src/DI/container.hpp
+++ b/src/DI/container.hpp
@@ -32,13 +32,13 @@ public:
 	Container() noexcept = default;
 
 	template <class Interface>
-	BindingBuilder<Interface> bind() noexcept;
+	auto bind() noexcept -> BindingBuilder<Interface>;
 
 	template <class Interface, class = std::enable_if_t<std::is_abstract_v<Interface>>>
-	std::shared_ptr<Interface> get() const noexcept;
+	auto get() const noexcept -> std::shared_ptr<Interface>;
 
 	template <typename Interface, typename = std::enable_if_t<is_func_v<Interface>>>
-	Interface get() const noexcept;
+	auto get() const noexcept -> Interface;
 
 	std::unordered_map<BaseObjectType, std::shared_ptr<IGenericWrapper>, ObjectTypeHasher>
 		bindings;
diff --git a/src/DI/container.tpp b/src/DI/container.tpp
index ed7f34f..2573223 100644
--- a/src/DI/container.tpp
+++ b/src/DI/container.tpp
@@ -32,13 +32,13 @@ void BindingBuilder<Interface>::to_factory(Interface func) noexcept
 }
 
 template <class Interface>
-BindingBuilder<Interface> Container::bind() noexcept
+auto Container::bind() noexcept -> BindingBuilder<Interface>
 {
 	return BindingBuilder<Interface>(this);
 }
 
 template <class Interface, class>
-std::shared_ptr<Interface> Container::get() const noexcept
+auto Container::get() const noexcept -> std::shared_ptr<Interface>
 {
 	ObjectType<Interface> interface_type;
 
@@ -57,7 +57,7 @@ std::shared_ptr<Interface> Container::get() const noexcept
 }
 
 template <typename Interface, typename>
-Interface Container::get() const noexcept
+auto Container::get() const noexcept -> Interface
 {
 	auto wrapper = std::dynamic_pointer_cast<IWrapper<Interface>>(
 		bindings.at(ObjectType<Interface>()));
diff --git a/src/DI/function_wrapper.hpp b/src/DI/function_wrapper.hpp
index e6468f2..b8d0cab 100644
--- a/src/DI/function_wrapper.hpp
+++ b/src/DI/function_wrapper.hpp
@@ -11,7 +11,7 @@ class FunctionWrapper : public IWrapper<Interface>
 public:
 	explicit FunctionWrapper(Interface func) noexcept;
 
-	[[nodiscard]] Interface get() const noexcept override;
+	[[nodiscard]] auto get() const noexcept -> Interface override;
 
 private:
 	const Interface _func;
diff --git a/src/DI/function_wrapper.tpp b/src/DI/function_wrapper.tpp
index 540a7aa..6a9c317 100644
--- a/src/DI/function_wrapper.tpp
+++ b/src/DI/function_wrapper.tpp
@@ -8,7 +8,7 @@ FunctionWrapper<Interface>::FunctionWrapper(Interface func) noexcept : _func(fun
 }
 
 template <class Interface>
-Interface FunctionWrapper<Interface>::get() const noexcept
+auto FunctionWrapper<Interface>::get() const noexcept -> Interface
 {
 	return _func;
 }
diff --git a/src/DI/interfaces/wrapper.hpp b/src/DI/interfaces/wrapper.hpp
index cde555f..e22ea7f 100644
--- a/src/DI/interfaces/wrapper.hpp
+++ b/src/DI/interfaces/wrapper.hpp
@@ -13,5 +13,5 @@ template <class Interface>
 class IWrapper : public IGenericWrapper
 {
 public:
-	[[nodiscard]] virtual Interface get() const noexcept = 0;
+	[[nodiscard]] virtual auto get() const noexcept -> Interface = 0;
 };
diff --git a/src/DI/object_type.cpp b/src/DI/object_type.cpp
index 008c4a4..64a23fa 100644
--- a/src/DI/object_type.cpp
+++ b/src/DI/object_type.cpp
@@ -5,22 +5,22 @@ BaseObjectType::BaseObjectType(const std::type_info &type_info) noexcept
 {
 }
 
-bool BaseObjectType::operator==(const BaseObjectType &object_type) const noexcept
+auto BaseObjectType::operator==(const BaseObjectType &object_type) const noexcept -> bool
 {
 	return hash() == object_type.hash();
 }
 
-std::size_t BaseObjectType::hash() const noexcept
+auto BaseObjectType::hash() const noexcept -> std::size_t
 {
 	return _type_info.hash_code();
 }
 
-std::string_view BaseObjectType::name() const noexcept
+auto BaseObjectType::name() const noexcept -> std::string_view
 {
-	return std::string_view(_type_info.name());
+	return {_type_info.name()};
 }
 
-std::size_t ObjectTypeHasher::operator()(const BaseObjectType &object_type) const noexcept
+auto ObjectTypeHasher::operator()(const BaseObjectType &object_type) const noexcept -> std::size_t
 {
 	return object_type.hash();
 }
diff --git a/src/DI/object_type.hpp b/src/DI/object_type.hpp
index 6b27682..5107dbf 100644
--- a/src/DI/object_type.hpp
+++ b/src/DI/object_type.hpp
@@ -8,11 +8,11 @@ class BaseObjectType
 public:
 	explicit BaseObjectType(const std::type_info &type_info) noexcept;
 
-	bool operator==(const BaseObjectType &object_type) const noexcept;
+	auto operator==(const BaseObjectType &object_type) const noexcept -> bool;
 
-	[[nodiscard]] std::size_t hash() const noexcept;
+	[[nodiscard]] auto hash() const noexcept -> std::size_t;
 
-	[[nodiscard]] std::string_view name() const noexcept;
+	[[nodiscard]] auto name() const noexcept -> std::string_view;
 
 private:
 	const std::type_info &_type_info;
@@ -28,5 +28,5 @@ public:
 class ObjectTypeHasher
 {
 public:
-	std::size_t operator()(const BaseObjectType &object_type) const noexcept;
+	auto operator()(const BaseObjectType &object_type) const noexcept -> std::size_t;
 };
diff --git a/src/DI/object_wrapper.hpp b/src/DI/object_wrapper.hpp
index 4aee9af..28121cb 100644
--- a/src/DI/object_wrapper.hpp
+++ b/src/DI/object_wrapper.hpp
@@ -11,7 +11,7 @@ class ObjectWrapper : public IWrapper<std::shared_ptr<Interface>>
 public:
 	explicit ObjectWrapper(const Container &container) noexcept : _container(container) {}
 
-	[[nodiscard]] std::shared_ptr<Interface> get() const noexcept override;
+	[[nodiscard]] auto get() const noexcept -> std::shared_ptr<Interface> override;
 
 private:
 	const Container &_container;
diff --git a/src/DI/object_wrapper.tpp b/src/DI/object_wrapper.tpp
index bbb7bee..5334247 100644
--- a/src/DI/object_wrapper.tpp
+++ b/src/DI/object_wrapper.tpp
@@ -3,7 +3,7 @@
 #include "object_wrapper.hpp"
 
 template <class Interface, class ObjectImpl>
-std::shared_ptr<Interface> ObjectWrapper<Interface, ObjectImpl>::get() const noexcept
+auto ObjectWrapper<Interface, ObjectImpl>::get() const noexcept -> std::shared_ptr<Interface>
 {
 	return ObjectImpl::resolve(_container);
 }
diff --git a/src/argument_parser.cpp b/src/argument_parser.cpp
index 94c6a4a..fd18bc7 100644
--- a/src/argument_parser.cpp
+++ b/src/argument_parser.cpp
@@ -19,9 +19,9 @@ void optarg_error(char arg, const std::string_view &error) noexcept
 /**
  * Returns the current optarg as a string view.
  */
-std::string_view get_str_optarg() noexcept
+auto get_str_optarg() noexcept -> std::string_view
 {
-	return std::string_view(optarg);
+	return {optarg};
 }
 
 /**
@@ -30,7 +30,7 @@ std::string_view get_str_optarg() noexcept
  * @param arg The current command-line argument character
  * @param check_zero Whether or not to make sure that the result is not zero
  */
-uint32_t get_uint_optarg(char arg, bool check_zero = false) noexcept
+auto get_uint_optarg(char arg, bool check_zero = false) noexcept -> uint32_t
 {
 	auto conversion_result = str_to_uint(get_str_optarg());
 
@@ -49,10 +49,10 @@ ArgumentParser::ArgumentParser(
 {
 }
 
-ParsedArguments ArgumentParser::parse(
+auto ArgumentParser::parse(
 	const std::vector<option> &options, const std::string_view &short_options,
 	const int &argc,
-	char *const *argv) noexcept // NOLINT(cppcoreguidelines-avoid-c-arrays,
+	char *const *argv) noexcept -> ParsedArguments // NOLINT(cppcoreguidelines-avoid-c-arrays,
 								// modernize-avoid-c-arrays)
 {
 	// NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic)
diff --git a/src/argument_parser.hpp b/src/argument_parser.hpp
index c7f33de..bee7c84 100644
--- a/src/argument_parser.hpp
+++ b/src/argument_parser.hpp
@@ -16,10 +16,10 @@ public:
 	explicit ArgumentParser(
 		IRandomNumberGeneratorFactory random_number_generator_factory) noexcept;
 
-	ParsedArguments parse(
+	auto parse(
 		const std::vector<option> &options, const std::string_view &short_options,
 		const int &argc,
-		char *const *argv) noexcept override; // NOLINT(cppcoreguidelines-avoid-c-arrays,
+		char *const *argv) noexcept -> ParsedArguments override; // NOLINT(cppcoreguidelines-avoid-c-arrays,
 											  // modernize-avoid-c-arrays)
 
 private:
diff --git a/src/bootstrap.cpp b/src/bootstrap.cpp
index 49808d6..1436301 100644
--- a/src/bootstrap.cpp
+++ b/src/bootstrap.cpp
@@ -49,7 +49,7 @@ auto construct_as_interface(Params &&...parameters) -> std::shared_ptr<Interface
 	return std::dynamic_pointer_cast<Interface>(std::make_shared<Impl>(parameters...));
 }
 
-Container bootstrap() noexcept
+auto bootstrap() noexcept -> Container
 {
 	auto container = Container();
 
diff --git a/src/bootstrap.hpp b/src/bootstrap.hpp
index 2c4fd1d..5e559c5 100644
--- a/src/bootstrap.hpp
+++ b/src/bootstrap.hpp
@@ -2,4 +2,4 @@
 
 #include "DI/container.hpp"
 
-Container bootstrap() noexcept;
+auto bootstrap() noexcept -> Container;
diff --git a/src/conversion.cpp b/src/conversion.cpp
index 4dbf651..078d66b 100644
--- a/src/conversion.cpp
+++ b/src/conversion.cpp
@@ -3,7 +3,7 @@
 #include <climits>
 #include <stdexcept>
 
-ConversionResult<uint32_t> str_to_uint(const std::string_view &str) noexcept
+auto str_to_uint(const std::string_view &str) noexcept -> ConversionResult<uint32_t>
 {
 	if (!ctre::match<IS_VALID_UINT>(str))
 	{
diff --git a/src/conversion.hpp b/src/conversion.hpp
index 9f6f933..f0bbc04 100644
--- a/src/conversion.hpp
+++ b/src/conversion.hpp
@@ -29,4 +29,4 @@ static constexpr auto IS_UINT_IN_RANGE = ctll::fixed_string("^[0-9]{1,19}$");
  * @param str A string that possibly is a unsigned integer
  * @returns A conversion result
  */
-ConversionResult<uint32_t> str_to_uint(const std::string_view &str) noexcept;
+auto str_to_uint(const std::string_view &str) noexcept -> ConversionResult<uint32_t>;
diff --git a/src/engine/data/bounds.cpp b/src/engine/data/bounds.cpp
index 1a8c4d0..ca67008 100644
--- a/src/engine/data/bounds.cpp
+++ b/src/engine/data/bounds.cpp
@@ -5,7 +5,7 @@ Bounds::Bounds(const BoundsOptions &options) noexcept
 {
 }
 
-Bounds::Value Bounds::get_width() const noexcept
+auto Bounds::get_width() const noexcept -> Bounds::Value
 {
 	return _width;
 }
@@ -15,7 +15,7 @@ void Bounds::set_width(Bounds::Value width) noexcept
 	_width = width;
 }
 
-Bounds::Value Bounds::get_height() const noexcept
+auto Bounds::get_height() const noexcept -> Bounds::Value
 {
 	return _height;
 }
@@ -25,7 +25,7 @@ void Bounds::set_height(Bounds::Value height) noexcept
 	_height = height;
 }
 
-CoordsValidation Bounds::validate_coords(const Vector2 &coords) const noexcept
+auto Bounds::validate_coords(const Vector2 &coords) const noexcept -> CoordsValidation
 {
 	if (static_cast<Bounds::Value>(coords.get_x()) >= _width)
 	{
@@ -50,7 +50,7 @@ CoordsValidation Bounds::validate_coords(const Vector2 &coords) const noexcept
 	return CoordsValidation::VALID;
 }
 
-const Bounds &Bounds::operator*=(const Bounds &rhs) noexcept
+auto Bounds::operator*=(const Bounds &rhs) noexcept -> const Bounds &
 {
 	_width *= rhs._width;
 	_height *= rhs._height;
@@ -58,7 +58,7 @@ const Bounds &Bounds::operator*=(const Bounds &rhs) noexcept
 	return *this;
 }
 
-const Bounds &Bounds::operator+=(const Bounds &rhs) noexcept
+auto Bounds::operator+=(const Bounds &rhs) noexcept -> const Bounds &
 {
 	_width += rhs._width;
 	_height += rhs._height;
@@ -66,7 +66,7 @@ const Bounds &Bounds::operator+=(const Bounds &rhs) noexcept
 	return *this;
 }
 
-const Bounds &Bounds::operator-=(const Bounds &rhs) noexcept
+auto Bounds::operator-=(const Bounds &rhs) noexcept -> const Bounds &
 {
 	_width -= rhs._width;
 	_height -= rhs._height;
@@ -74,7 +74,7 @@ const Bounds &Bounds::operator-=(const Bounds &rhs) noexcept
 	return *this;
 }
 
-Bounds Bounds::operator-(const Bounds &rhs) const noexcept
+auto Bounds::operator-(const Bounds &rhs) const noexcept -> Bounds
 {
 	auto new_bounds = Bounds(*this);
 
diff --git a/src/engine/data/bounds.hpp b/src/engine/data/bounds.hpp
index ccea2c3..5444503 100644
--- a/src/engine/data/bounds.hpp
+++ b/src/engine/data/bounds.hpp
@@ -26,21 +26,21 @@ public:
 
 	explicit Bounds(const BoundsOptions &options) noexcept;
 
-	[[nodiscard]] Value get_width() const noexcept;
+	[[nodiscard]] auto get_width() const noexcept -> Value;
 
 	void set_width(Value width) noexcept;
 
-	[[nodiscard]] Value get_height() const noexcept;
+	[[nodiscard]] auto get_height() const noexcept -> Value;
 
 	void set_height(Value height) noexcept;
 
-	[[nodiscard]] CoordsValidation validate_coords(const Vector2 &coords) const noexcept;
+	[[nodiscard]] auto validate_coords(const Vector2 &coords) const noexcept -> CoordsValidation;
 
-	const Bounds &operator*=(const Bounds &rhs) noexcept;
-	const Bounds &operator+=(const Bounds &rhs) noexcept;
-	const Bounds &operator-=(const Bounds &rhs) noexcept;
+	auto operator*=(const Bounds &rhs) noexcept -> const Bounds &;
+	auto operator+=(const Bounds &rhs) noexcept -> const Bounds &;
+	auto operator-=(const Bounds &rhs) noexcept -> const Bounds &;
 
-	Bounds operator-(const Bounds &rhs) const noexcept;
+	auto operator-(const Bounds &rhs) const noexcept -> Bounds;
 
 private:
 	Value _width = 0U;
diff --git a/src/engine/data/vector2.cpp b/src/engine/data/vector2.cpp
index b838051..0554930 100644
--- a/src/engine/data/vector2.cpp
+++ b/src/engine/data/vector2.cpp
@@ -2,7 +2,7 @@
 
 #include "util/hash.hpp"
 
-Vector2::Value Vector2::get_x() const noexcept
+auto Vector2::get_x() const noexcept -> Vector2::Value
 {
 	return _x;
 }
@@ -12,7 +12,7 @@ void Vector2::set_x(Vector2::Value x) noexcept
 	_x = x;
 }
 
-Vector2::Value Vector2::get_y() const noexcept
+auto Vector2::get_y() const noexcept -> Vector2::Value
 {
 	return _y;
 }
@@ -22,13 +22,13 @@ void Vector2::set_y(Vector2::Value y) noexcept
 	_y = y;
 }
 
-Vector2 Vector2::to_direction(const Vector2 &direction,
-							  Vector2::Value amount) const noexcept
+auto Vector2::to_direction(const Vector2 &direction,
+							  Vector2::Value amount) const noexcept -> Vector2
 {
 	return *this + (direction * Vector2({.x = amount, .y = amount}));
 }
 
-const Vector2 &Vector2::operator+=(const Vector2 &rhs) noexcept
+auto Vector2::operator+=(const Vector2 &rhs) noexcept -> const Vector2 &
 {
 	_x += rhs._x;
 	_y += rhs._y;
@@ -36,7 +36,7 @@ const Vector2 &Vector2::operator+=(const Vector2 &rhs) noexcept
 	return *this;
 }
 
-const Vector2 &Vector2::operator-=(const Vector2 &rhs) noexcept
+auto Vector2::operator-=(const Vector2 &rhs) noexcept -> const Vector2 &
 {
 	_x -= rhs._x;
 	_y -= rhs._y;
@@ -44,7 +44,7 @@ const Vector2 &Vector2::operator-=(const Vector2 &rhs) noexcept
 	return *this;
 }
 
-Vector2 Vector2::operator+(const Vector2 &rhs) const noexcept
+auto Vector2::operator+(const Vector2 &rhs) const noexcept -> Vector2
 {
 	auto new_vector2 = Vector2(*this);
 
@@ -54,7 +54,7 @@ Vector2 Vector2::operator+(const Vector2 &rhs) const noexcept
 	return new_vector2;
 }
 
-Vector2 Vector2::operator-(const Vector2 &rhs) const noexcept
+auto Vector2::operator-(const Vector2 &rhs) const noexcept -> Vector2
 {
 	auto new_vector2 = Vector2(*this);
 
@@ -64,7 +64,7 @@ Vector2 Vector2::operator-(const Vector2 &rhs) const noexcept
 	return new_vector2;
 }
 
-Vector2 Vector2::operator*(const Vector2 &rhs) const noexcept
+auto Vector2::operator*(const Vector2 &rhs) const noexcept -> Vector2
 {
 	auto new_vector2 = *this;
 
@@ -74,12 +74,12 @@ Vector2 Vector2::operator*(const Vector2 &rhs) const noexcept
 	return new_vector2;
 }
 
-bool Vector2::operator==(const Vector2 &rhs) const noexcept
+auto Vector2::operator==(const Vector2 &rhs) const noexcept -> bool
 {
 	return _x == rhs._x && _y == rhs._y;
 }
 
-std::size_t Vector2Hasher::operator()(const Vector2 &vector2) const noexcept
+auto Vector2Hasher::operator()(const Vector2 &vector2) const noexcept -> std::size_t
 {
 	std::size_t result_hash = 0;
 
diff --git a/src/engine/data/vector2.hpp b/src/engine/data/vector2.hpp
index 78eba11..95baf1c 100644
--- a/src/engine/data/vector2.hpp
+++ b/src/engine/data/vector2.hpp
@@ -22,30 +22,30 @@ public:
 	{
 	}
 
-	[[nodiscard]] Value get_x() const noexcept;
+	[[nodiscard]] auto get_x() const noexcept -> Value;
 
 	void set_x(Value x) noexcept;
 
-	[[nodiscard]] Value get_y() const noexcept;
+	[[nodiscard]] auto get_y() const noexcept -> Value;
 
 	void set_y(Value y) noexcept;
 
-	[[nodiscard]] Vector2 to_direction(const Vector2 &direction,
-									   Vector2::Value amount) const noexcept;
+	[[nodiscard]] auto to_direction(const Vector2 &direction,
+									   Vector2::Value amount) const noexcept -> Vector2;
 
-	const Vector2 &operator+=(const Vector2 &rhs) noexcept;
-	const Vector2 &operator-=(const Vector2 &rhs) noexcept;
+	auto operator+=(const Vector2 &rhs) noexcept -> const Vector2 &;
+	auto operator-=(const Vector2 &rhs) noexcept -> const Vector2 &;
 
-	Vector2 operator+(const Vector2 &rhs) const noexcept;
-	Vector2 operator-(const Vector2 &rhs) const noexcept;
-	Vector2 operator*(const Vector2 &rhs) const noexcept;
+	auto operator+(const Vector2 &rhs) const noexcept -> Vector2;
+	auto operator-(const Vector2 &rhs) const noexcept -> Vector2;
+	auto operator*(const Vector2 &rhs) const noexcept -> Vector2;
 
-	bool operator==(const Vector2 &rhs) const noexcept;
+	auto operator==(const Vector2 &rhs) const noexcept -> bool;
 
 	/**
 	 *  Returns Vector2({.x = 0, .y = -1})
 	 */
-	static constexpr Vector2 up() noexcept
+	static constexpr auto up() noexcept -> Vector2
 	{
 		return Vector2({.x = 0, .y = -1});
 	}
@@ -53,7 +53,7 @@ public:
 	/**
 	 *  Returns Vector2({.x = 0, .y = 1})
 	 */
-	static constexpr Vector2 down() noexcept
+	static constexpr auto down() noexcept -> Vector2
 	{
 		return Vector2({.x = 0, .y = 1});
 	}
@@ -61,7 +61,7 @@ public:
 	/**
 	 *  Returns Vector2({.x = -1, .y = 0})
 	 */
-	static constexpr Vector2 left() noexcept
+	static constexpr auto left() noexcept -> Vector2
 	{
 
 		return Vector2({.x = -1, .y = 0});
@@ -70,7 +70,7 @@ public:
 	/**
 	 *  Returns Vector2({.x = 1, .y = 0})
 	 */
-	static constexpr Vector2 right() noexcept
+	static constexpr auto right() noexcept -> Vector2
 	{
 		return Vector2({.x = 1, .y = 0});
 	}
@@ -83,5 +83,5 @@ private:
 class Vector2Hasher
 {
 public:
-	std::size_t operator()(const Vector2 &vector2) const noexcept;
+	auto operator()(const Vector2 &vector2) const noexcept -> std::size_t;
 };
diff --git a/src/engine/graphics/matrix.hpp b/src/engine/graphics/matrix.hpp
index 2c9ba81..f71018b 100644
--- a/src/engine/graphics/matrix.hpp
+++ b/src/engine/graphics/matrix.hpp
@@ -23,21 +23,21 @@ public:
 
 	void fill(Element element) noexcept override;
 
-	[[nodiscard]] Element get(const Vector2 &pos) const noexcept override;
+	[[nodiscard]] auto get(const Vector2 &pos) const noexcept -> Element override;
 
 	void set(const Vector2 &pos, Element element) noexcept override;
 
-	[[nodiscard]] uint32_t get_row_cnt() const noexcept override;
+	[[nodiscard]] auto get_row_cnt() const noexcept -> uint32_t override;
 
-	[[nodiscard]] uint32_t get_column_cnt() const noexcept override;
+	[[nodiscard]] auto get_column_cnt() const noexcept -> uint32_t override;
 
-	[[nodiscard]] MatrixIterator<Element> begin() const noexcept override;
+	[[nodiscard]] auto begin() const noexcept -> MatrixIterator<Element> override;
 
-	[[nodiscard]] MatrixIterator<Element> end() const noexcept override;
+	[[nodiscard]] auto end() const noexcept -> MatrixIterator<Element> override;
 
-	Matrix &operator=(const Matrix &rhs) noexcept;
+	auto operator=(const Matrix &rhs) noexcept -> Matrix &;
 
-	Matrix &operator=(Matrix &&rhs) noexcept;
+	auto operator=(Matrix &&rhs) noexcept -> Matrix &;
 
 private:
 	gsl::owner<Element **> _matrix;
diff --git a/src/engine/graphics/matrix.tpp b/src/engine/graphics/matrix.tpp
index e0e65bb..527c61f 100644
--- a/src/engine/graphics/matrix.tpp
+++ b/src/engine/graphics/matrix.tpp
@@ -49,7 +49,7 @@ void Matrix<Element>::fill(Element element) noexcept
 }
 
 template <typename Element>
-Element Matrix<Element>::get(const Vector2 &pos) const noexcept
+auto Matrix<Element>::get(const Vector2 &pos) const noexcept -> Element
 {
 
 	auto x = static_cast<std::size_t>(pos.get_x());
@@ -70,31 +70,31 @@ void Matrix<Element>::set(const Vector2 &pos, Element element) noexcept
 }
 
 template <typename Element>
-uint32_t Matrix<Element>::get_row_cnt() const noexcept
+auto Matrix<Element>::get_row_cnt() const noexcept -> uint32_t
 {
 	return _row_cnt;
 }
 
 template <typename Element>
-uint32_t Matrix<Element>::get_column_cnt() const noexcept
+auto Matrix<Element>::get_column_cnt() const noexcept -> uint32_t
 {
 	return _column_cnt;
 }
 
 template <typename Element>
-MatrixIterator<Element> Matrix<Element>::begin() const noexcept
+auto Matrix<Element>::begin() const noexcept -> MatrixIterator<Element>
 {
 	return MatrixIterator(_matrix, _column_cnt);
 }
 
 template <typename Element>
-MatrixIterator<Element> Matrix<Element>::end() const noexcept
+auto Matrix<Element>::end() const noexcept -> MatrixIterator<Element>
 {
 	return MatrixIterator(_matrix + _row_cnt, _column_cnt);
 }
 
 template <typename Element>
-Matrix<Element> &Matrix<Element>::operator=(const Matrix &rhs) noexcept
+auto Matrix<Element>::operator=(const Matrix &rhs) noexcept -> Matrix<Element> &
 {
 	if (&rhs != this)
 	{
@@ -111,7 +111,7 @@ Matrix<Element> &Matrix<Element>::operator=(const Matrix &rhs) noexcept
 }
 
 template <typename Element>
-Matrix<Element> &Matrix<Element>::operator=(Matrix &&rhs) noexcept
+auto Matrix<Element>::operator=(Matrix &&rhs) noexcept -> Matrix<Element> &
 {
 	if (&rhs != this)
 	{
diff --git a/src/engine/graphics/scene.cpp b/src/engine/graphics/scene.cpp
index 24c174f..c27a6d5 100644
--- a/src/engine/graphics/scene.cpp
+++ b/src/engine/graphics/scene.cpp
@@ -45,7 +45,7 @@ void Scene::leave() noexcept
 	_is_shown = false;
 }
 
-const std::shared_ptr<IMatrix<std::string_view>> &Scene::get_matrix() const noexcept
+auto Scene::get_matrix() const noexcept -> const std::shared_ptr<IMatrix<std::string_view>> &
 {
 	return _matrix;
 }
diff --git a/src/engine/graphics/scene.hpp b/src/engine/graphics/scene.hpp
index c4f6d67..3dcaa2d 100644
--- a/src/engine/graphics/scene.hpp
+++ b/src/engine/graphics/scene.hpp
@@ -23,8 +23,8 @@ public:
 
 	void leave() noexcept override;
 
-	[[nodiscard]] const std::shared_ptr<IMatrix<std::string_view>> &
-	get_matrix() const noexcept override;
+	[[nodiscard]] auto
+	get_matrix() const noexcept -> const std::shared_ptr<IMatrix<std::string_view>> & override;
 
 private:
 	bool _is_shown;
diff --git a/src/engine/graphics/window.cpp b/src/engine/graphics/window.cpp
index d6bae0c..bb33402 100644
--- a/src/engine/graphics/window.cpp
+++ b/src/engine/graphics/window.cpp
@@ -2,7 +2,7 @@
 
 #include <sys/ioctl.h>
 
-Bounds Window::size() const noexcept
+auto Window::size() const noexcept -> Bounds
 {
 	winsize window_size = {};
 
diff --git a/src/engine/graphics/window.hpp b/src/engine/graphics/window.hpp
index c9a9c70..69c04c3 100644
--- a/src/engine/graphics/window.hpp
+++ b/src/engine/graphics/window.hpp
@@ -10,5 +10,5 @@ class Window : public IWindow, public AutoWirable<IWindow, Window>
 public:
 	Window() noexcept = default;
 
-	[[nodiscard]] Bounds size() const noexcept override;
+	[[nodiscard]] auto size() const noexcept -> Bounds override;
 };
diff --git a/src/engine/matrix_iterator.hpp b/src/engine/matrix_iterator.hpp
index 5d35052..674216f 100644
--- a/src/engine/matrix_iterator.hpp
+++ b/src/engine/matrix_iterator.hpp
@@ -10,13 +10,13 @@ public:
 
 	explicit MatrixRowIterator(ColumnPtr column_ptr) noexcept;
 
-	MatrixRowIterator &operator++() noexcept;
-	MatrixRowIterator operator++(int) noexcept;
+	auto operator++() noexcept -> MatrixRowIterator &;
+	auto operator++(int) noexcept -> MatrixRowIterator;
 
-	Element &operator*() const noexcept;
+	auto operator*() const noexcept -> Element &;
 
-	bool operator==(const MatrixRowIterator &rhs) const noexcept;
-	bool operator!=(const MatrixRowIterator &rhs) const noexcept;
+	auto operator==(const MatrixRowIterator &rhs) const noexcept -> bool;
+	auto operator!=(const MatrixRowIterator &rhs) const noexcept -> bool;
 
 private:
 	ColumnPtr _column_ptr;
@@ -30,9 +30,9 @@ public:
 
 	explicit MatrixRow(RowPtr row_ptr, const uint32_t &column_cnt) noexcept;
 
-	[[nodiscard]] MatrixRowIterator<Element> begin() const noexcept;
+	[[nodiscard]] auto begin() const noexcept -> MatrixRowIterator<Element>;
 
-	[[nodiscard]] MatrixRowIterator<Element> end() const noexcept;
+	[[nodiscard]] auto end() const noexcept -> MatrixRowIterator<Element>;
 
 private:
 	RowPtr _row_ptr;
@@ -48,13 +48,13 @@ public:
 
 	explicit MatrixIterator(RowPtr row_ptr, const uint32_t &column_cnt) noexcept;
 
-	MatrixIterator &operator++() noexcept;
-	MatrixIterator operator++(int) noexcept;
+	auto operator++() noexcept -> MatrixIterator &;
+	auto operator++(int) noexcept -> MatrixIterator;
 
-	MatrixRow<Element> operator*() const noexcept;
+	auto operator*() const noexcept -> MatrixRow<Element>;
 
-	bool operator==(const MatrixIterator &rhs) const noexcept;
-	bool operator!=(const MatrixIterator &rhs) const noexcept;
+	auto operator==(const MatrixIterator &rhs) const noexcept -> bool;
+	auto operator!=(const MatrixIterator &rhs) const noexcept -> bool;
 
 private:
 	RowPtr _row_ptr;
diff --git a/src/engine/matrix_iterator.tpp b/src/engine/matrix_iterator.tpp
index 52952c9..031136c 100644
--- a/src/engine/matrix_iterator.tpp
+++ b/src/engine/matrix_iterator.tpp
@@ -11,7 +11,7 @@ MatrixRowIterator<Element>::MatrixRowIterator(ColumnPtr column_ptr) noexcept
 }
 
 template <typename Element>
-MatrixRowIterator<Element> &MatrixRowIterator<Element>::operator++() noexcept
+auto MatrixRowIterator<Element>::operator++() noexcept -> MatrixRowIterator<Element> &
 {
 	++_column_ptr;
 
@@ -19,7 +19,7 @@ MatrixRowIterator<Element> &MatrixRowIterator<Element>::operator++() noexcept
 }
 
 template <typename Element>
-MatrixRowIterator<Element> MatrixRowIterator<Element>::operator++(int) noexcept
+auto MatrixRowIterator<Element>::operator++(int) noexcept -> MatrixRowIterator<Element>
 {
 	auto copy = *this;
 
@@ -29,19 +29,19 @@ MatrixRowIterator<Element> MatrixRowIterator<Element>::operator++(int) noexcept
 }
 
 template <typename Element>
-Element &MatrixRowIterator<Element>::operator*() const noexcept
+auto MatrixRowIterator<Element>::operator*() const noexcept -> Element &
 {
 	return *_column_ptr;
 }
 
 template <typename Element>
-bool MatrixRowIterator<Element>::operator==(const MatrixRowIterator &rhs) const noexcept
+auto MatrixRowIterator<Element>::operator==(const MatrixRowIterator &rhs) const noexcept -> bool
 {
 	return _column_ptr == rhs._column_ptr;
 }
 
 template <typename Element>
-bool MatrixRowIterator<Element>::operator!=(const MatrixRowIterator &rhs) const noexcept
+auto MatrixRowIterator<Element>::operator!=(const MatrixRowIterator &rhs) const noexcept -> bool
 {
 	return _column_ptr != rhs._column_ptr;
 }
@@ -55,13 +55,13 @@ MatrixRow<Element>::MatrixRow(RowPtr row_ptr, const uint32_t &column_cnt) noexce
 }
 
 template <typename Element>
-MatrixRowIterator<Element> MatrixRow<Element>::begin() const noexcept
+auto MatrixRow<Element>::begin() const noexcept -> MatrixRowIterator<Element>
 {
 	return MatrixRowIterator<Element>(_row_ptr);
 }
 
 template <typename Element>
-MatrixRowIterator<Element> MatrixRow<Element>::end() const noexcept
+auto MatrixRow<Element>::end() const noexcept -> MatrixRowIterator<Element>
 {
 	return MatrixRowIterator<Element>(_row_ptr + _column_cnt);
 }
@@ -76,7 +76,7 @@ MatrixIterator<Element>::MatrixIterator(RowPtr row_ptr,
 }
 
 template <typename Element>
-MatrixIterator<Element> &MatrixIterator<Element>::operator++() noexcept
+auto MatrixIterator<Element>::operator++() noexcept -> MatrixIterator<Element> &
 {
 	++_row_ptr;
 
@@ -84,7 +84,7 @@ MatrixIterator<Element> &MatrixIterator<Element>::operator++() noexcept
 }
 
 template <typename Element>
-MatrixIterator<Element> MatrixIterator<Element>::operator++(int) noexcept
+auto MatrixIterator<Element>::operator++(int) noexcept -> MatrixIterator<Element>
 {
 	auto copy = *this;
 
@@ -94,19 +94,19 @@ MatrixIterator<Element> MatrixIterator<Element>::operator++(int) noexcept
 }
 
 template <typename Element>
-MatrixRow<Element> MatrixIterator<Element>::operator*() const noexcept
+auto MatrixIterator<Element>::operator*() const noexcept -> MatrixRow<Element>
 {
 	return MatrixRow(*_row_ptr, _column_cnt);
 }
 
 template <typename Element>
-bool MatrixIterator<Element>::operator==(const MatrixIterator &rhs) const noexcept
+auto MatrixIterator<Element>::operator==(const MatrixIterator &rhs) const noexcept -> bool
 {
 	return _row_ptr == rhs._row_ptr;
 }
 
 template <typename Element>
-bool MatrixIterator<Element>::operator!=(const MatrixIterator &rhs) const noexcept
+auto MatrixIterator<Element>::operator!=(const MatrixIterator &rhs) const noexcept -> bool
 {
 	return _row_ptr != rhs._row_ptr;
 }
diff --git a/src/engine/user/cursor.cpp b/src/engine/user/cursor.cpp
index 2a72663..2b240b9 100644
--- a/src/engine/user/cursor.cpp
+++ b/src/engine/user/cursor.cpp
@@ -34,7 +34,7 @@ void CursorController::move_to(const Vector2 &position, bool silent) noexcept
 	}
 }
 
-Vector2 CursorController::where() const noexcept
+auto CursorController::where() const noexcept -> Vector2
 {
 	return _position;
 }
diff --git a/src/engine/user/cursor.hpp b/src/engine/user/cursor.hpp
index fd75374..ccdf71a 100644
--- a/src/engine/user/cursor.hpp
+++ b/src/engine/user/cursor.hpp
@@ -39,7 +39,7 @@ public:
 
 	void move_to(const Vector2 &position, bool silent) noexcept override;
 
-	[[nodiscard]] Vector2 where() const noexcept override;
+	[[nodiscard]] auto where() const noexcept -> Vector2 override;
 
 	void ensure_position() noexcept override;
 
diff --git a/src/engine/user/input.cpp b/src/engine/user/input.cpp
index 81fe2f6..87d8a68 100644
--- a/src/engine/user/input.cpp
+++ b/src/engine/user/input.cpp
@@ -60,8 +60,8 @@ void InputHandler::leave_raw_mode() noexcept
 	_original_termios = nullptr;
 }
 
-InputHandler::_SubscribersSizeType
-InputHandler::_event_as_index(const Event &event) noexcept
+auto
+InputHandler::_event_as_index(const Event &event) noexcept -> InputHandler::_SubscribersSizeType
 {
 	return static_cast<_SubscribersSizeType>(static_cast<uint8_t>(event));
 }
diff --git a/src/engine/user/input.hpp b/src/engine/user/input.hpp
index f86d0d0..0a437ef 100644
--- a/src/engine/user/input.hpp
+++ b/src/engine/user/input.hpp
@@ -36,5 +36,5 @@ private:
 
 	using _SubscribersSizeType = decltype(_subscribers)::size_type;
 
-	static _SubscribersSizeType _event_as_index(const Event &event) noexcept;
+	static auto _event_as_index(const Event &event) noexcept -> _SubscribersSizeType;
 };
diff --git a/src/game/game.cpp b/src/game/game.cpp
index 6632c08..88b9584 100644
--- a/src/game/game.cpp
+++ b/src/game/game.cpp
@@ -57,8 +57,8 @@ void Game::on_exit() const noexcept
 	std::cout.flush();
 }
 
-std::unordered_map<char, std::shared_ptr<ICommand>>
-Game::get_input_config() const noexcept
+auto Game::get_input_config() const noexcept
+	-> std::unordered_map<char, std::shared_ptr<ICommand>>
 {
 	return {{'q', std::make_shared<QuitCommand>()},
 			{'i', std::make_shared<InsertCellCommand>(_cursor_controller, _scene)},
diff --git a/src/game/game.hpp b/src/game/game.hpp
index 5894a01..dfbe619 100644
--- a/src/game/game.hpp
+++ b/src/game/game.hpp
@@ -25,8 +25,8 @@ public:
 
 	void on_exit() const noexcept override;
 
-	[[nodiscard]] std::unordered_map<char, std::shared_ptr<ICommand>>
-	get_input_config() const noexcept override;
+	[[nodiscard]] auto get_input_config() const noexcept
+		-> std::unordered_map<char, std::shared_ptr<ICommand>> override;
 
 private:
 	std::shared_ptr<IWindow> _window;
diff --git a/src/game/generation_tracker.cpp b/src/game/generation_tracker.cpp
index 0e137cb..0a7a923 100644
--- a/src/game/generation_tracker.cpp
+++ b/src/game/generation_tracker.cpp
@@ -2,12 +2,12 @@
 
 GenerationTracker::GenerationTracker(bool is_paused) noexcept : _is_paused(is_paused) {}
 
-uint32_t GenerationTracker::get_current_generation() const noexcept
+auto GenerationTracker::get_current_generation() const noexcept -> uint32_t
 {
 	return _current_generation;
 }
 
-bool GenerationTracker::get_is_paused() const noexcept
+auto GenerationTracker::get_is_paused() const noexcept -> bool
 {
 	return _is_paused;
 }
diff --git a/src/game/generation_tracker.hpp b/src/game/generation_tracker.hpp
index 0e59751..bd15a3e 100644
--- a/src/game/generation_tracker.hpp
+++ b/src/game/generation_tracker.hpp
@@ -9,9 +9,9 @@ class GenerationTracker : public IGenerationTracker
 public:
 	explicit GenerationTracker(bool is_paused) noexcept;
 
-	[[nodiscard]] uint32_t get_current_generation() const noexcept override;
+	[[nodiscard]] auto get_current_generation() const noexcept -> uint32_t override;
 
-	[[nodiscard]] bool get_is_paused() const noexcept override;
+	[[nodiscard]] auto get_is_paused() const noexcept -> bool override;
 
 	void set_is_paused(bool is_paused) noexcept override;
 
diff --git a/src/game/statusline.cpp b/src/game/statusline.cpp
index 221258c..6becb38 100644
--- a/src/game/statusline.cpp
+++ b/src/game/statusline.cpp
@@ -51,7 +51,7 @@ void StatusLine::set_status(StatusLineSection section,
 	_move_back(previous_position);
 }
 
-Vector2 StatusLine::_move_to_statusline(int32_t x) noexcept
+auto StatusLine::_move_to_statusline(int32_t x) noexcept -> Vector2
 {
 	const auto previous_position = _cursor_controller->where();
 
@@ -72,7 +72,7 @@ void StatusLine::_move_back(Vector2 previous_position) noexcept
 	_cursor_controller->show();
 }
 
-int32_t StatusLine::_get_section_start_x(StatusLineSection section) const noexcept
+auto StatusLine::_get_section_start_x(StatusLineSection section) const noexcept -> int32_t
 {
 	int32_t section_start = 0;
 
diff --git a/src/game/statusline.hpp b/src/game/statusline.hpp
index 7db1e0b..a14ab20 100644
--- a/src/game/statusline.hpp
+++ b/src/game/statusline.hpp
@@ -31,11 +31,11 @@ private:
 	std::shared_ptr<ICursorController> _cursor_controller;
 	std::shared_ptr<IWindow> _window;
 
-	Vector2 _move_to_statusline(int32_t x) noexcept;
+	auto _move_to_statusline(int32_t x) noexcept -> Vector2;
 
 	void _move_back(Vector2 previous_position) noexcept;
 
-	int32_t _get_section_start_x(StatusLineSection section) const noexcept;
+	auto _get_section_start_x(StatusLineSection section) const noexcept -> int32_t;
 
 	void _clear_section(StatusLineSection section) noexcept;
 };
diff --git a/src/game_of_life.cpp b/src/game_of_life.cpp
index 6af6809..1daf5b8 100644
--- a/src/game_of_life.cpp
+++ b/src/game_of_life.cpp
@@ -10,7 +10,7 @@ const std::vector<option> options = {option({"seed", required_argument, nullptr,
 									 option({"help", no_argument, nullptr, 'h'}),
 									 option({nullptr, 0, nullptr, 0})};
 
-int main(int argc, char *argv[]) noexcept
+auto main(int argc, char *argv[]) noexcept -> int
 {
 	auto container = bootstrap();
 
diff --git a/src/interfaces/argument_parser.hpp b/src/interfaces/argument_parser.hpp
index efcbaf3..8769698 100644
--- a/src/interfaces/argument_parser.hpp
+++ b/src/interfaces/argument_parser.hpp
@@ -18,9 +18,9 @@ class IArgumentParser
 public:
 	virtual ~IArgumentParser() noexcept = default;
 
-	virtual ParsedArguments
-	parse(const std::vector<option> &options, const std::string_view &short_options,
-		  const int &argc,
-		  char *const *argv) noexcept = 0; // NOLINT(cppcoreguidelines-avoid-c-arrays,
-										   // modernize-avoid-c-arrays)
+	virtual auto parse(const std::vector<option> &options,
+					   const std::string_view &short_options, const int &argc,
+					   char *const *argv) noexcept
+		-> ParsedArguments = 0; // NOLINT(cppcoreguidelines-avoid-c-arrays,
+								// modernize-avoid-c-arrays)
 };
diff --git a/src/interfaces/cursor.hpp b/src/interfaces/cursor.hpp
index caa89df..f6521cb 100644
--- a/src/interfaces/cursor.hpp
+++ b/src/interfaces/cursor.hpp
@@ -27,7 +27,7 @@ public:
 	// NOLINTNEXTLINE(google-default-arguments)
 	virtual void move_to(const Vector2 &position, bool silent = false) noexcept = 0;
 
-	[[nodiscard]] virtual Vector2 where() const noexcept = 0;
+	[[nodiscard]] virtual auto where() const noexcept -> Vector2 = 0;
 
 	virtual void ensure_position() noexcept = 0;
 
diff --git a/src/interfaces/game.hpp b/src/interfaces/game.hpp
index 3e547f5..46d79e4 100644
--- a/src/interfaces/game.hpp
+++ b/src/interfaces/game.hpp
@@ -20,8 +20,8 @@ public:
 
 	virtual void on_exit() const noexcept = 0;
 
-	[[nodiscard]] virtual std::unordered_map<char, std::shared_ptr<ICommand>>
-	get_input_config() const noexcept = 0;
+	[[nodiscard]] virtual auto get_input_config() const noexcept
+		-> std::unordered_map<char, std::shared_ptr<ICommand>> = 0;
 };
 
 using IGameFactory = std::shared_ptr<IGame> (*)(
diff --git a/src/interfaces/generation_tracker.hpp b/src/interfaces/generation_tracker.hpp
index 76f241a..fcd2426 100644
--- a/src/interfaces/generation_tracker.hpp
+++ b/src/interfaces/generation_tracker.hpp
@@ -9,9 +9,9 @@ class IGenerationTracker
 public:
 	virtual ~IGenerationTracker() noexcept = default;
 
-	[[nodiscard]] virtual uint32_t get_current_generation() const noexcept = 0;
+	[[nodiscard]] virtual auto get_current_generation() const noexcept -> uint32_t = 0;
 
-	[[nodiscard]] virtual bool get_is_paused() const noexcept = 0;
+	[[nodiscard]] virtual auto get_is_paused() const noexcept -> bool = 0;
 
 	virtual void set_is_paused(bool is_paused) noexcept = 0;
 };
diff --git a/src/interfaces/matrix.hpp b/src/interfaces/matrix.hpp
index 2b33342..edcf935 100644
--- a/src/interfaces/matrix.hpp
+++ b/src/interfaces/matrix.hpp
@@ -21,21 +21,21 @@ public:
 
 	virtual void fill(Element element) noexcept = 0;
 
-	[[nodiscard]] virtual Element get(const Vector2 &pos) const noexcept = 0;
+	[[nodiscard]] virtual auto get(const Vector2 &pos) const noexcept -> Element = 0;
 
 	virtual void set(const Vector2 &pos, Element element) noexcept = 0;
 
-	[[nodiscard]] virtual uint32_t get_row_cnt() const noexcept = 0;
+	[[nodiscard]] virtual auto get_row_cnt() const noexcept -> uint32_t = 0;
 
-	[[nodiscard]] virtual uint32_t get_column_cnt() const noexcept = 0;
+	[[nodiscard]] virtual auto get_column_cnt() const noexcept -> uint32_t = 0;
 
-	[[nodiscard]] virtual MatrixIterator<Element> begin() const noexcept = 0;
+	[[nodiscard]] virtual auto begin() const noexcept -> MatrixIterator<Element> = 0;
 
-	[[nodiscard]] virtual MatrixIterator<Element> end() const noexcept = 0;
+	[[nodiscard]] virtual auto end() const noexcept -> MatrixIterator<Element> = 0;
 
-	IMatrix &operator=(const IMatrix &matrix) noexcept = default;
+	auto operator=(const IMatrix &matrix) noexcept -> IMatrix & = default;
 
-	IMatrix &operator=(IMatrix &&matrix) noexcept = default;
+	auto operator=(IMatrix &&matrix) noexcept -> IMatrix & = default;
 };
 
 template <typename Element>
diff --git a/src/interfaces/randomization.hpp b/src/interfaces/randomization.hpp
index 211360e..eb8bd30 100644
--- a/src/interfaces/randomization.hpp
+++ b/src/interfaces/randomization.hpp
@@ -8,7 +8,7 @@ class ISeedGenerator
 public:
 	virtual ~ISeedGenerator() noexcept = default;
 
-	[[nodiscard]] virtual uint32_t random_seed() const noexcept = 0;
+	[[nodiscard]] virtual auto random_seed() const noexcept -> uint32_t = 0;
 };
 
 using ISeedGeneratorFactory = std::shared_ptr<ISeedGenerator> (*)();
@@ -25,8 +25,8 @@ public:
 	 * @param a A number lower than b
 	 * @param b A number greater than a
 	 */
-	[[nodiscard]] virtual uint32_t in_range(const uint32_t &a,
-											const uint32_t &b) const noexcept = 0;
+	[[nodiscard]] virtual auto in_range(const uint32_t &a,
+										const uint32_t &b) const noexcept -> uint32_t = 0;
 };
 
 using IRandomNumberGeneratorFactory =
diff --git a/src/interfaces/scene.hpp b/src/interfaces/scene.hpp
index 3b440b0..3960985 100644
--- a/src/interfaces/scene.hpp
+++ b/src/interfaces/scene.hpp
@@ -16,8 +16,8 @@ public:
 
 	virtual void leave() noexcept = 0;
 
-	[[nodiscard]] virtual const std::shared_ptr<IMatrix<std::string_view>> &
-	get_matrix() const noexcept = 0;
+	[[nodiscard]] virtual auto get_matrix() const noexcept
+		-> const std::shared_ptr<IMatrix<std::string_view>> & = 0;
 };
 
 using ISceneFactory = std::shared_ptr<IScene> (*)(
diff --git a/src/interfaces/window.hpp b/src/interfaces/window.hpp
index d880762..6fc56e9 100644
--- a/src/interfaces/window.hpp
+++ b/src/interfaces/window.hpp
@@ -8,5 +8,5 @@ class IWindow
 public:
 	virtual ~IWindow() noexcept = default;
 
-	[[nodiscard]] virtual Bounds size() const noexcept = 0;
+	[[nodiscard]] virtual auto size() const noexcept -> Bounds = 0;
 };
diff --git a/src/randomization/generator.cpp b/src/randomization/generator.cpp
index 6956eda..2febf16 100644
--- a/src/randomization/generator.cpp
+++ b/src/randomization/generator.cpp
@@ -5,8 +5,8 @@ RandomNumberGenerator::RandomNumberGenerator(const uint32_t &seed) noexcept
 	this->_generator = std::make_unique<std::mt19937>(seed);
 }
 
-uint32_t RandomNumberGenerator::in_range(const uint32_t &a,
-										 const uint32_t &b) const noexcept
+auto RandomNumberGenerator::in_range(const uint32_t &a,
+										 const uint32_t &b) const noexcept -> uint32_t
 {
 	auto random_distribution = std::uniform_int_distribution<uint32_t>(a, b);
 
diff --git a/src/randomization/generator.hpp b/src/randomization/generator.hpp
index 4b002dd..98acfde 100644
--- a/src/randomization/generator.hpp
+++ b/src/randomization/generator.hpp
@@ -10,8 +10,8 @@ class RandomNumberGenerator : public IRandomNumberGenerator
 public:
 	explicit RandomNumberGenerator(const uint32_t &seed) noexcept;
 
-	[[nodiscard]] uint32_t in_range(const uint32_t &a,
-									const uint32_t &b) const noexcept override;
+	[[nodiscard]] auto in_range(const uint32_t &a,
+									const uint32_t &b) const noexcept -> uint32_t override;
 
 private:
 	std::unique_ptr<std::mt19937> _generator;
diff --git a/src/randomization/seed_generator.cpp b/src/randomization/seed_generator.cpp
index 3afa275..5aedf17 100644
--- a/src/randomization/seed_generator.cpp
+++ b/src/randomization/seed_generator.cpp
@@ -6,7 +6,7 @@ SeedGenerator::SeedGenerator(
 {
 }
 
-uint32_t SeedGenerator::random_seed() const noexcept
+auto SeedGenerator::random_seed() const noexcept -> uint32_t
 {
 	return (*_random_device)();
 }
diff --git a/src/randomization/seed_generator.hpp b/src/randomization/seed_generator.hpp
index 087ad6b..2439949 100644
--- a/src/randomization/seed_generator.hpp
+++ b/src/randomization/seed_generator.hpp
@@ -11,7 +11,7 @@ public:
 	explicit SeedGenerator(
 		const std::shared_ptr<std::random_device> &random_device) noexcept;
 
-	[[nodiscard]] uint32_t random_seed() const noexcept override;
+	[[nodiscard]] auto random_seed() const noexcept -> uint32_t override;
 
 private:
 	const std::shared_ptr<std::random_device> &_random_device;
diff --git a/src/util/color.cpp b/src/util/color.cpp
index 17665de..10496b1 100644
--- a/src/util/color.cpp
+++ b/src/util/color.cpp
@@ -2,13 +2,13 @@
 
 #include <fmt/color.h>
 
-std::string get_foreground_esc_seq(const uint32_t &color) noexcept
+auto get_foreground_esc_seq(const uint32_t &color) noexcept -> std::string
 {
 	return std::string(
 		fmt::detail::make_foreground_color<char>(fmt::detail::color_type(color)).begin());
 }
 
-std::string get_background_esc_seq(const uint32_t &color) noexcept
+auto get_background_esc_seq(const uint32_t &color) noexcept -> std::string
 {
 	return std::string(
 		fmt::detail::make_background_color<char>(fmt::detail::color_type(color)).begin());
diff --git a/src/util/color.hpp b/src/util/color.hpp
index 5511893..f7c38d2 100644
--- a/src/util/color.hpp
+++ b/src/util/color.hpp
@@ -5,6 +5,6 @@
 
 constexpr fmt::string_view RESET_ALL_MODES = "{esc}[0m";
 
-std::string get_foreground_esc_seq(const uint32_t &color) noexcept;
+auto get_foreground_esc_seq(const uint32_t &color) noexcept -> std::string;
 
-std::string get_background_esc_seq(const uint32_t &color) noexcept;
+auto get_background_esc_seq(const uint32_t &color) noexcept -> std::string;