What are some examples of C++ metaprogramming?

What are some examples of C++ metaprogramming?

C++ metaprogramming allows you to write code that generates code at compile time. Examples include template metaprogramming and SFINAE.

Can you explain template metaprogramming?

Sure! Template metaprogramming uses templates to perform computations at compile time, enabling optimizations and type manipulations.

What is SFINAE?

SFINAE stands for 'Substitution Failure Is Not An Error'. It allows the compiler to ignore certain template instantiations if they fail.

Can you give a simple code example?

Certainly! Here's a simple example of a template that calculates the factorial at compile time:

template<int N>
struct Factorial {
    static const int value = N * Factorial<N - 1>::value;
};

template<>
struct Factorial<0> {
    static const int value = 1;
};

This computes the factorial of a number at compile time.