http://whackylabs.com/rants/?p=1228

generic

#include <iostream>

struct Vector2 {
    
    float x;
    float y;
    
    Vector2(float x = 0, float y = 0) {
        
        this->x = x;
        this->y = y;
    }
};

template <typename T>
T min(T a, T b) {
    return a < b ? a : b;
}

template <>
Vector2 min(Vector2 a, Vector2 b) {
    return Vector2(min(a.x, b.x), min(a.y, b.y));
}

template <typename T>
T max(T a, T b) {
    return a > b ? a : b;
}

template <>
Vector2 max(Vector2 a, Vector2 b) {
    return Vector2(max(a.x, b.x), max(a.y, b.y));
}

template <typename T>
T clamp(T value, T lowerBound, T upperBound) {
    return min(max(lowerBound, value), upperBound);
}

std::ostream &operator<<(std::ostream &os, const Vector2 &v) {
    os << v.x << ", " << v.y;
    return os;
}


int main() {
    Vector2 lowerBound(-100, -100);
    Vector2 upperBound(100, 100);
    
    std::cout << clamp(Vector2(200, 200), lowerBound, upperBound) << std::endl;
    std::cout <<  clamp(Vector2(-200, -200), lowerBound, upperBound) << std::endl;
    std::cout << clamp(Vector2(-10, -134), lowerBound, upperBound) << std::endl;
    std::cout <<  clamp(Vector2(10, 134), lowerBound, upperBound) << std::endl;
    
    std::cout <<  min(Vector2(-10, -134), lowerBound) << std::endl;
    std::cout <<  max(Vector2(10, 134), upperBound) << std::endl;
    
}