Function allocate_unique
Synopsis
#include <src/entt/core/memory.hpp>
template <typename Type, typename Allocator, typename... Args>
auto allocate_unique(Allocator &allocator, Args &&...args)
Description
Allows std::unique_ptr to use allocators (waiting for C++20).
- Template Parameters
Type- Type of object to allocate for and to construct.Allocator- Type of allocator used to manage memory and elements.Args- Types of arguments to use to construct the object.- Parameters
allocator- The allocator to use.args- Parameters to use to construct the object.- Returns
- A properly initialized unique pointer with a custom deleter.
Mentioned in
- Core Functionalities / Allocator aware unique pointers
Source
Lines 145-164 in src/entt/core/memory.hpp.
template<typename Type, typename Allocator, typename... Args>
auto allocate_unique(Allocator &allocator, Args &&...args) {
static_assert(!std::is_array_v<Type>, "Array types are not supported");
using alloc_traits = typename std::allocator_traits<Allocator>::template rebind_traits<Type>;
using allocator_type = typename alloc_traits::allocator_type;
allocator_type alloc{allocator};
auto ptr = alloc_traits::allocate(alloc, 1u);
ENTT_TRY {
alloc_traits::construct(alloc, to_address(ptr), std::forward<Args>(args)...);
}
ENTT_CATCH {
alloc_traits::deallocate(alloc, ptr, 1u);
ENTT_THROW;
}
return std::unique_ptr<Type, allocation_deleter<allocator_type>>{ptr, alloc};
}