the following code will generate a C2825 error in VS2005Beta2 July:
#include "stdafx.h" #include <vector> #include <iostream> int _tmain(int argc, _TCHAR* argv[]) { int i = 3, j = 6; std::swap<int>(i, j);//C2825 //but use std::swap<> <i, j>; will be ok return 0; } |
I don't know why this , but who else can explain it to me?
many thanks.
yes, I just want to pass the template parameters explicited. but it will cause a error when #include <vector> ,
the following codes works well in the Version before VS2005 July,
#include <vector> #include <iostream> int _tmain(int argc, _TCHAR* argv[]) { double i = 3, j = 6; std::swap<double> (i, j); //C2528 when in VS 2005 July return 0; } |
,
what cause this problem? thanks.
std::swap<>(i, j);
The empty "<>" lets the compiler know that it should only consider function templates but the fact that it is empty means that the regular type deduction process will occur.
Note: in this case it is unnecessary as the std namespace is reserved and the only swap functions in std are all template functions (or explicit specializations of template functions).
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