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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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