include/boost/capy/detail/run.hpp

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1		//
2		// Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com)
3		//
4		// Distributed under the Boost Software License, Version 1.0. (See accompanying
5		// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6		//
7		// Official repository: https://github.com/cppalliance/capy
8		//
9
10		#ifndef BOOST_CAPY_DETAIL_RUN_HPP
11		#define BOOST_CAPY_DETAIL_RUN_HPP
12
13		#include <boost/capy/detail/config.hpp>
14		#include <boost/capy/detail/frame_memory_resource.hpp>
15
16		#include <cstddef>
17		#include <memory_resource>
18
19		namespace boost {
20		namespace capy {
21		namespace detail {
22
23		/// Concept for standard Allocator types.
24		template<class A>
25		concept Allocator = requires(A a, std::size_t n) {
26		typename A::value_type;
27		{ a.allocate(n) } -> std::same_as<typename A::value_type*>;
28		};
29
30		/// Specialization for memory_resource* - stores pointer directly.
31		template<>
32		class frame_memory_resource<std::pmr::memory_resource*>
33		{
34		std::pmr::memory_resource* mr_;
35
36		public:
37	5	explicit frame_memory_resource(std::pmr::memory_resource* mr) noexcept
38	5	: mr_(mr)
39		{
40	5	}
41
42	5	std::pmr::memory_resource* get() noexcept { return mr_; }
43		};
44
45		/// Specialization for void - no allocator (empty).
46		template<>
47		class frame_memory_resource<void>
48		{
49		public:
50		frame_memory_resource() = default;
51
52		std::pmr::memory_resource* get() noexcept { return nullptr; }
53		};
54
55		} // namespace detail
56		} // namespace capy
57		} // namespace boost
58
59		#endif
60