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Fix template related compilation errors of VC++.

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This commit is contained in:
Cheng Zhao 2013-12-09 16:34:10 +08:00
commit 597e17b540
2 changed files with 33 additions and 3 deletions
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34
common/swap_or_assign.h
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@ -5,8 +5,37 @@
#ifndef ATOM_COMMON_SWAP_OR_ASSIGN_H_
#define ATOM_COMMON_SWAP_OR_ASSIGN_H_
#include "base/compiler_specific.h"
namespace internal {
#if defined(OS_WIN)
template<typename T> inline
void SwapOrAssign(T& v1, const T& v2) {
__if_exists(T::swap) {
v1.swap(const_cast<T&>(v2));
}
__if_not_exists(T::swap) {
v1 = v2;
}
}
template<typename T> inline
void SwapOrAssign(T*& v1, T* v2) {
v1 = v2;
}
inline
void SwapOrAssign(int& v1, int v2) {
v1 = v2;
}
inline
void SwapOrAssign(bool& v1, bool v2) {
v1 = v2;
}
#else // defined(OS_WIN)
// Helper to detect whether value has specified method.
template <typename T>
class HasSwapMethod {
@ -24,17 +53,18 @@ struct enable_if {};
template<class T>
struct enable_if<true, T> { typedef T type; };
template<typename T>
template<typename T> inline
typename enable_if<HasSwapMethod<T>::value>::type SwapOrAssign(
T& v1, const T& v2) {
v1.swap(const_cast<T&>(v2));
}
template<typename T>
template<typename T> inline
typename enable_if<!HasSwapMethod<T>::value>::type SwapOrAssign(
T& v1, const T& v2) {
v1 = v2;
}
#endif // !defined(OS_WIN)
} // namespace internal