How Do I Explicitly Instantiate a Template Function in C ?

Explicitly Instantiating a Template Function

In this scenario, you wish to instantiate a template function with a single argument without invoking it. Explicit instantiation involves manually creating an instance of the template without using its function call.

You specified the following template function:

template <class T> int function_name(T a) {}

While your attempt to instantiate the function as follows:

template int function_name<int>(int);

resulted in the following errors:

error: expected primary-expression before 'template'
error: expected `;` before 'template'

The correct approach to explicitly instantiate the function is as follows:

template <typename T> void func(T param) {} // definition

template void func<int>(int param); // explicit instantiation.

In contrast to template instantiation, template specialization involves defining a specific implementation for a particular template parameter type. To specialize the func template for int parameters, you would use the following syntax:

template <typename T> void func(T param) {} // definition

template <> void func<int>(int param) {} // specialization

Notice the angle brackets after template in the specialization syntax.

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