Why Does Calling a Template Member Function from a Template Function Require the \"template\" Keyword?

Template Member Function Invocation from Template Function

In the provided code, a compilation error occurs when attempting to call a template member function f from within a template function g. The error, reported by GCC, indicates that the usage of f<3> is invalid.

To resolve this error, the correct syntax for calling a template member function from a template function is to prefix the member function name with the template keyword. This is because the compiler requires explicit indication that the member function is a template specialization when used in such a context.

The corrected code would be:

<code class="cpp">template<class T> void g()
{
   A<T> a;
   a.template f<3>();  // Add 'template' keyword here
}</code>

This syntax ensures that the compiler correctly identifies and instantiates the appropriate template specialization of the member function f.

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