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149 lines
3.4 KiB
C++
149 lines
3.4 KiB
C++
// Copyright (c) 2005 Daniel Wallin
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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// OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef LUABIND_GET_POINTER_051023_HPP
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# define LUABIND_GET_POINTER_051023_HPP
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#include <memory>
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#include <stdexcept>
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// TODO: Rename to pointer_traits
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namespace luabind {
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template<typename T>
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T* get_pointer(T* pointer)
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{
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return pointer;
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}
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template<typename T>
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T* get_pointer(const std::unique_ptr<T>& pointer)
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{
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return pointer.get();
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}
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template<typename T>
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T* get_pointer(const std::shared_ptr<T>& pointer)
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{
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return pointer.get();
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}
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namespace detail {
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template<typename T>
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struct pointer_traits {
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enum { is_pointer = false };
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};
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template<typename T>
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struct pointer_traits<T*>
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{
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enum { is_pointer = true };
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using value_type = T;
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};
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template<typename T>
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struct pointer_traits<std::unique_ptr<T>>
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{
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enum { is_pointer = true };
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using value_type = T;
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};
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template<typename T>
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struct pointer_traits<std::shared_ptr<T>>
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{
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enum { is_pointer = true };
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using value_type = T;
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};
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template<typename T>
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using is_pointer_to_const = std::is_const< typename pointer_traits<T>::value_type >;
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template<typename T>
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void release_ownership(std::unique_ptr<T>& p)
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{
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p.release();
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}
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template <class P>
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void release_ownership(P const&)
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{
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throw std::runtime_error(
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"luabind: smart pointer does not allow ownership transfer");
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}
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namespace has_get_pointer_
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{
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struct any
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{
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template<class T> any(T const&);
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};
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struct no_overload_tag
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{};
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typedef char(&yes)[1];
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typedef char(&no)[2];
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no_overload_tag operator, (no_overload_tag, int);
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template<class T>
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T* get_pointer(T const volatile*);
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template<class T>
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T* get_pointer(std::unique_ptr<T> const&);
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template<class T>
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T* get_pointer(std::shared_ptr<T> const&);
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detail::has_get_pointer_::no_overload_tag
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get_pointer(detail::has_get_pointer_::any);
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///@TODO: Rework
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template<class T>
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yes check(T const&);
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no check(no_overload_tag);
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template<class T>
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struct impl
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{
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static typename std::add_lvalue_reference<T>::type x;
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static const bool value = (sizeof(has_get_pointer_::check((get_pointer(x), 0))) == 1);
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typedef std::integral_constant<bool, value> type;
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};
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} // namespace has_get_pointer_
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template<class T>
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struct has_get_pointer
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: has_get_pointer_::impl<T>::type
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{};
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} // namespace detail
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} // namespace luabind
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#endif // LUABIND_GET_POINTER_051023_HPP
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