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Binary function that returns its first argument. More...
Binary function that returns its first argument.
|Arg1||Type of the first argument, and type of the return value.|
|Arg2||Type of the second argument. It may differ from the type of the first argument.|
This function object might be defined in the std namespace; it is an SGI extension to the STL. We can't count on it living in the std namespace, but it's useful, so we define it here.
If you apply
using namespace std; to the global namespace, and if your STL implementation includes project1st, it will cause collisions with this definition. We recommend for this and other reasons not to state
using namespace std; in the global namespace.