С++ Challenge: p1 - на шаблонах.

[shahmatiuga]

Итак, задача: Sum of naturals divisible by 3 and 5

Write a program that calculates and prints the sum of all the natural numbers divisible by either 3 or 5, up to a given limit entered by the user.
Решение:

#include // if operator for templates template struct If; template struct If { enum { RESULT = ThenValue }; }; template struct If { enum { RESULT = ElseValue }; }; // solution template struct Sum { enum { RESULT = If::RESULT + Sum::RESULT }; }; // endstop template<> struct Sum<0> { enum { RESULT = 0 }; }; int main() { std::cout << "sum = " << Sum<100>::RESULT; return 0; }