This Fibonacci implementation is part of a compare-and-contrast with this other Fibonacci implementation: https://gist.github.com/kinchungwong/7700777 Technically speaking, this version has 3 essential semicolons, while the other implementation (300 lines of commented code) has 46 essential semicolons.

Cpp_Fibonacci_ThreeLines.cpp

#include <iostream>

// Technically The First Line of Code - by semicolon counting.

template <int N> 
struct Fibonacci 
	: std::integral_constant<
		int, 
		Fibonacci<N - 1>::value + Fibonacci<N - 2>::value
	>
{};

// Technically The Second Line of Code.

template <> struct Fibonacci<0> : std::integral_constant<int, 1> {};

// Technically The Third Line of Code.

template <> struct Fibonacci<1> : std::integral_constant<int, 1> {};

// The main function is totally irrelevant.
// Not included in the lines of code.
// (If you must ask - semicolons in comments don't count.)

int main() 
{
	std::cout << "Fibonacci<0> : " << Fibonacci<0>::value << std::endl;
	std::cout << "Fibonacci<1> : " << Fibonacci<1>::value << std::endl;
	std::cout << "Fibonacci<2> : " << Fibonacci<2>::value << std::endl;
	std::cout << "Fibonacci<3> : " << Fibonacci<3>::value << std::endl;
	std::cout << "Fibonacci<4> : " << Fibonacci<4>::value << std::endl;
	std::cout << "Fibonacci<5> : " << Fibonacci<5>::value << std::endl;
	return 0;
}