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#pragma once
#include "value_functor.hpp"
// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
#define VALUE_FUNCTOR_TEMPLATE template <class Return, class... Args>
// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
#define VALUE_FUNCTOR ValueFunctor<Return(Args...)>
VALUE_FUNCTOR_TEMPLATE
VALUE_FUNCTOR::ValueFunctor() noexcept : _functor(nullptr) {}
VALUE_FUNCTOR_TEMPLATE
template <class Function, class Allocator>
VALUE_FUNCTOR::ValueFunctor(Function &&function, const Allocator &allocator)
: _functor(nullptr)
{
using AllocTraits = std::allocator_traits<Allocator>;
using Functor = CopyableFunctor<Function, Allocator, Return(Args...)>;
using FunctorAlloc = typename RebindAllocHelper<AllocTraits, Functor>::type;
if (not_null(function))
{
auto functor_alloc = FunctorAlloc(allocator);
if (sizeof(Functor) <= sizeof(_buf) &&
std::is_nothrow_copy_constructible<Function>::value &&
std::is_nothrow_copy_constructible<FunctorAlloc>::value)
{
// NOLINTNEXTLINE(cppcoreguidelines-owning-memory)
_functor = ::new (static_cast<void *>(&_buf))
Functor(std::forward<Function>(function), Allocator(functor_alloc));
}
else
{
using Destructor = AllocDestructor<FunctorAlloc>;
auto hold = std::unique_ptr<TargetFunctor, Destructor>(
functor_alloc.allocate(1), Destructor(functor_alloc, 1));
::new (static_cast<void *>(hold.get()))
Functor(std::forward<Function>(function), Allocator(allocator));
_functor = hold.release();
}
}
}
VALUE_FUNCTOR_TEMPLATE
VALUE_FUNCTOR::ValueFunctor(const ValueFunctor &val_functor)
{
if (val_functor._functor == nullptr)
{
_functor = nullptr;
}
else if (static_cast<void *>(val_functor._functor) == &val_functor._buf)
{
_functor = _as_copyable_functor(&_buf);
val_functor._functor->clone(_functor);
}
else
{
_functor = val_functor._functor->clone();
}
}
VALUE_FUNCTOR_TEMPLATE
VALUE_FUNCTOR::ValueFunctor(ValueFunctor &&val_functor) noexcept
{
if (val_functor._functor == nullptr)
{
_functor = nullptr;
}
else if (static_cast<void *>(val_functor._functor) == &val_functor._buf)
{
_functor = _as_copyable_functor(&_buf);
val_functor._functor->clone(_functor);
}
else
{
_functor = val_functor._functor;
val_functor._functor = nullptr;
}
}
VALUE_FUNCTOR_TEMPLATE
VALUE_FUNCTOR::~ValueFunctor()
{
if (static_cast<void *>(_functor) == &_buf)
{
_functor->destroy();
}
else if (_functor)
{
_functor->destroy_deallocate();
}
}
VALUE_FUNCTOR_TEMPLATE
auto VALUE_FUNCTOR::operator=(ValueFunctor &&val_functor) noexcept -> ValueFunctor &
{
*this = nullptr;
if (val_functor._functor == nullptr)
{
_functor = nullptr;
}
else if (static_cast<void *>(val_functor._functor) == &val_functor._buf)
{
_functor = _as_copyable_functor(&_buf);
val_functor._functor->clone(_functor);
}
else
{
_functor = val_functor._functor;
val_functor._functor = nullptr;
}
return *this;
}
VALUE_FUNCTOR_TEMPLATE
auto VALUE_FUNCTOR::operator=(std::nullptr_t) -> ValueFunctor &
{
TargetFunctor *old_functor = _functor;
_functor = nullptr;
if (static_cast<void *>(old_functor) == &_buf)
{
old_functor->destroy();
}
else if (old_functor)
{
old_functor->destroy_deallocate();
}
return *this;
}
VALUE_FUNCTOR_TEMPLATE
auto VALUE_FUNCTOR::operator()(Args &&...args) const -> Return
{
if (_functor == nullptr)
{
std::abort();
}
return (*_functor)(std::forward<Args>(args)...);
}
VALUE_FUNCTOR_TEMPLATE
VALUE_FUNCTOR::operator bool() const noexcept
{
return _functor != nullptr;
}
VALUE_FUNCTOR_TEMPLATE
auto VALUE_FUNCTOR::target_type() const noexcept -> const std::type_info &
{
if (_functor == nullptr)
{
return typeid(void);
}
return _functor->target_type();
}
VALUE_FUNCTOR_TEMPLATE
template <typename Target>
auto VALUE_FUNCTOR::target() const noexcept -> const Target *
{
if (_functor == nullptr)
{
return nullptr;
}
return static_cast<const Target *>(_functor->target(typeid(Target)));
}
VALUE_FUNCTOR_TEMPLATE
auto VALUE_FUNCTOR::_as_copyable_functor(void *function_ptr) -> TargetFunctor *
{
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
return reinterpret_cast<TargetFunctor *>(function_ptr);
}
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