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Template Metaprogramming in C++
When we write programs to do computation at compile time using a template, that is called Template Metaprogramming.
Example Code
#include <iostream>
using namespace std;
template<int n>struct power {
enum { value = 4*power<n-1>::value };
};
template<>struct power<0> {
enum { value = 1 };
};
int main() {
cout <<”power is:”<< power<7>::value << endl;
return 0;
}Output
power is:16384
In above example, When compiler sees power<7>::value, it tries to create an instance of power with parameter as 7, it turns out that power<6>must also be created as enumeration constant value must be evaluated at compile time. For power<6>, compiler need power<5>and so on. Finally, compiler uses funStruct<1>::value and compile time recursion terminates. This is called template metaprogramming.
Updated on: 30-Jul-2019
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