Temporary Objects Cannot be Bound to Non-Const References 

In previous releases of Visual C++, non-const references could be bound to temporary objects. Now, temporary objects can only be bound to const references.

Example

For example, the following sample compiles has different run-time behavior in Visual Studio .NET 2003 compared to Visual Studio .NET:

// bc_temp_objects_not_bound_to_nonconst_ref.cpp
// compile with: /EHsc
#include "iostream"
using namespace std;
class C {};

void f(C & c) { cout << "C&" << endl; }
void f(C const & c) { cout << "C const &" << endl; }

int main() {
   f(C());
}

Output

C const &

See Also

Reference

Breaking Changes in the Visual C++ Compiler