Hi there, the C++ standard (section 20.2) defines std::make_pair() as:
template <class T1, class T2>
pair<T1, T2> make_pair(const T1& x, const T2& y);
On my system (.NET 2003) it is defined as:
template<class _Ty1, class _Ty2> inline
pair<_Ty1, _Ty2> __cdecl make_pair(_Ty1 _Val1, _Ty2 _Val2)
{
// return pair composed from arguments
return (pair<_Ty1, _Ty2>(_Val1, _Val2));
}
In particular, not that the arguments _Val1 and _Val2 are passed in by
value, and not by reference.
Is this a bug in the .NET library? or is this actually allowed by the
spec?
3  3435  ma***********@perform-sol.com wrote: Hi there, the C++ standard (section 20.2) defines std::make_pair() as:
template <class T1, class T2>
pair<T1, T2> make_pair(const T1& x, const T2& y);
On my system (.NET 2003) it is defined as:
template<class _Ty1, class _Ty2> inline
pair<_Ty1, _Ty2> __cdecl make_pair(_Ty1 _Val1, _Ty2 _Val2)
{
// return pair composed from arguments
return (pair<_Ty1, _Ty2>(_Val1, _Val2));
}
In particular, not that the arguments _Val1 and _Val2 are passed in by
value, and not by reference.
Is this a bug in the .NET library? or is this actually allowed by the
spec?
That was changed in the 2003 revision of the standard. It now says
template < class T1 , class T2 >
pair <T1 , T2 > make_pair (T1 x , T2 y );
7 Returns: pair<T1, T2>(x, y).
--
Pete Becker
Dinkumware, Ltd. ( http://www.dinkumware.com)
very interesting - what is the reason for this change?
ma***********@perform-sol.com wrote: very interesting - what is the reason for this change?
make_pair("abc", 3);
used to be illegal, because the first argument creates a reference to an
array, which can't be copied. With the new version the type of the first
argument decays to pointer to const char.
--
Pete Becker
Dinkumware, Ltd. ( http://www.dinkumware.com) This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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