非型テンプレートパラメータ

              
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#include <iostream>

// Non-type parameter means we won't use typename
// Instead you can use an actual type for it
template<int N>
void PrintValue() { std::cout << N << std::endl; }

int main() 
{
    // Call the template function with a literal integer
    PrintValue<5>(); // 5
}

              
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#include <iostream>

// Template function to calculate the square of a non-type parameter I
template<int I>
int Square() { return I * I; } // Return the square of I 

int main() 
{
    // The result of Square<5>() is computed at compile time
    int b = Square<5>(); // b will be initialized to 25
}