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Explicit Template Argument Specification

One of the newer features in C++ is the ability to explicitly specify argument types for function templates. As a simple example of this, consider the following:

template <class T> void f(int i) { T x = i; ... } void g() { f<double>(37); }

It used to be that you'd have to use all the template parameter types (like T) in the declaration of the template, but this is no longer required. In this example, T is declared via the <> specification to be of type double, and the actual function parameter is of course an int.

One possible application for the feature is the ability to specify what a template's return type should be:

template <class T, class U, class V> V max(T t, U u) { if (t > u) return V(t); else return V(u); } void g() { int i = max<double,double,int>(12.34, 43.21); }

independent of reliance on the template function arguments.