How Do I Explicitly Instantiate a Template Function Without Calling It?

Explicit Template Function Instantiation

Instantiating a template function involves creating a specific implementation for a particular type. This is distinct from calling the function or specializing it for a specific type.

Question:

You have defined a template function with one argument and wish to explicitly instantiate it without invoking it.

Answer:

To explicitly instantiate the function, follow these steps:

1. Define the template function:

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

2. Instantiate the template for the desired type:

   template void function_name<int>(int); // Explicit instantiation

However, the code you provided contains syntax errors. The corrected version should be:

template <> void function_name<int>(int); // Explicit instantiation

Note on Specialization vs. Instantiation:

Be aware that explicit instantiation differs from template specialization. Specialization creates a new version of the function for a specific type, while explicit instantiation creates an instance of the original template for a specific type.

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