


How Do I Explicitly Instantiate a Template Function Without Calling It?
Dec 01, 2024 pm 10:29 PMExplicit 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:
-
Define the template function:
template <class T> int function_name(T a) {}
-
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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