C++ temporary variable lifetime

Question

Is this code valid?

int foo()
{
    std::vector& v = std::vector(5, \"X\");

    // Do something silly...
         


        

Answer 1

The code you've shown is illegal – temporaries can only bind to rvalue references or const lvalue references.

VC++ happens to allow it as an extension (and gives a level 4 warning saying so).