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68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
#pragma once
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#include <new>
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#include <utility>
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#include "concept.h"
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#include "pool_alloc.h"
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namespace ipc {
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// pimpl small object optimization helpers
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template <typename T, typename R = T*>
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using IsImplComfortable = ipc::require<(sizeof(T) <= sizeof(T*)), R>;
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template <typename T, typename R = T*>
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using IsImplUncomfortable = ipc::require<(sizeof(T) > sizeof(T*)), R>;
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template <typename T, typename... P>
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constexpr auto make_impl(P&&... params) -> IsImplComfortable<T> {
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T* buf {};
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::new (&buf) T { std::forward<P>(params)... };
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return buf;
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}
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template <typename T>
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constexpr auto impl(T* const (& p)) -> IsImplComfortable<T> {
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return reinterpret_cast<T*>(&const_cast<char &>(reinterpret_cast<char const &>(p)));
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}
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template <typename T>
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constexpr auto clear_impl(T* p) -> IsImplComfortable<T, void> {
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if (p != nullptr) impl(p)->~T();
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}
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template <typename T, typename... P>
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constexpr auto make_impl(P&&... params) -> IsImplUncomfortable<T> {
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return mem::alloc<T>(std::forward<P>(params)...);
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}
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template <typename T>
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constexpr auto clear_impl(T* p) -> IsImplUncomfortable<T, void> {
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mem::free(p);
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}
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template <typename T>
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constexpr auto impl(T* const (& p)) -> IsImplUncomfortable<T> {
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return p;
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}
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template <typename T>
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struct pimpl {
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template <typename... P>
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constexpr static T* make(P&&... params) {
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return make_impl<T>(std::forward<P>(params)...);
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}
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#if __cplusplus >= 201703L
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constexpr void clear() {
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#else /*__cplusplus < 201703L*/
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void clear() {
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#endif/*__cplusplus < 201703L*/
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clear_impl(static_cast<T*>(const_cast<pimpl*>(this)));
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}
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};
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} // namespace ipc
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