C++ High Performance by Björn Andrist Viktor Sehr

Author:Björn Andrist, Viktor Sehr
Language: eng
Format: epub
Publisher: Packt
Published: 2020-12-10T11:44:53+00:00

The following code will oblige the compiler to instantiate two distinct functions: one squares the value and one cubes the value:

auto x2 = const_pow_n<2>(4.0f); // Square auto x3 = const_pow_n<3>(4.0f); // Cube

Note the difference between the template parameter N and the function parameter v. For every value of N, the compiler generates a new function. However, v is passed as a regular parameter and, as such, does not result in a new function.

Providing specializations of a template

By default, the compiler will generate regular C++ code whenever we use a template with new parameters. But it's also possible to provide a custom implementation for certain values of the template parameters. Say, for example, that we want to provide the regular C++ code of our const_pow_n() function when it's used with integers and the value of N is 2. We could write a template specialization for this case, as follows:

template<> auto const_pow_n<2, int>(const int& v) { return v * v; }

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