protot/3rdparty/bx/include/tinystl/traits.h

86 lines
2.7 KiB
C++

/*-
* Copyright 2012 Matthew Endsley
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted providing that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TINYSTL_TRAITS_H
#define TINYSTL_TRAITS_H
#include "new.h"
#if defined(__GNUC__) && defined(__is_pod)
# define TINYSTL_TRY_POD_OPTIMIZATION(t) __is_pod(t)
#elif defined(_MSC_VER)
# define TINYSTL_TRY_POD_OPTIMIZATION(t) (!__is_class(t) || __is_pod(t))
#else
# define TINYSTL_TRY_POD_OPTIMIZATION(t) false
#endif
namespace tinystl {
template<typename T, bool pod = TINYSTL_TRY_POD_OPTIMIZATION(T)> struct pod_traits {};
template<typename T, T t> struct swap_holder;
template<typename T>
static inline void move_impl(T& a, T& b, ...) {
a = b;
}
template<typename T>
static inline void move_impl(T& a, T& b, T*, swap_holder<void (T::*)(T&), &T::swap>* = 0) {
a.swap(b);
}
template<typename T>
static inline void move(T& a, T&b) {
move_impl(a, b, (T*)0);
}
template<typename T>
static inline void move_construct_impl(T* a, T& b, ...) {
new(placeholder(), a) T(b);
}
template<typename T>
static inline void move_construct_impl(T* a, T& b, void*, swap_holder<void (T::*)(T&), &T::swap>* = 0) {
// If your type T does not have a default constructor, simply insert:
// struct tinystl_nomove_construct;
// in the class definition
new(placeholder(), a) T;
a->swap(b);
}
template<typename T>
static inline void move_construct_impl(T* a, T& b, T*, typename T::tinystl_nomove_construct* = 0) {
new(placeholder(), a) T(b);
}
template<typename T>
static inline void move_construct(T* a, T& b) {
move_construct_impl(a, b, (T*)0);
}
}
#endif