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add octa::make_pair and octa::exchange

master
Daniel Kolesa 2015-06-02 02:01:32 +01:00
parent bfc94e31d7
commit 49b9a8d17f
2 changed files with 36 additions and 1 deletions
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2
octa/algorithm.h
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@ -373,7 +373,7 @@ namespace octa {
__range1.pop_front();
__range2.pop_front();
}
return octa::Pair<_R1, _R2>(__range1, __range2);
return octa::make_pair(__range1, __range2);
}
template<typename _R, typename _T>

35
octa/utility.h
View File

@ -30,6 +30,15 @@ namespace octa {
return static_cast<_T &&>(__v);
}
/* exchange */
template<typename _T, typename _U = _T>
_T exchange(_T &__v, _U &&__nv) {
_T __old = move(__v);
__v = forward<_U>(__nv);
return __old;
}
/* declval */
template<typename _T> AddRvalueReference<_T> declval();
@ -125,6 +134,32 @@ namespace octa {
octa::swap(second, __v.second);
}
};
template<typename _T> struct ReferenceWrapper;
template<typename _T>
struct __OctaMakePairRetBase {
typedef _T Type;
};
template<typename _T>
struct __OctaMakePairRetBase<ReferenceWrapper<_T>> {
typedef _T &Type;
};
template<typename _T>
struct __OctaMakePairRet {
typedef typename __OctaMakePairRetBase<octa::Decay<_T>>::Type Type;
};
template<typename _T, typename _U>
Pair<typename __OctaMakePairRet<_T>::Type,
typename __OctaMakePairRet<_U>::Type
> make_pair(_T &&__a, _U &&__b) {
return Pair<typename __OctaMakePairRet<_T>::Type,
typename __OctaMakePairRet<_U>::Type
>(forward<_T>(__a), forward<_U>(__b));;
}
}
#endif