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#include <iostream>
#include "namespaces.hpp"
// to access a namespace the notation is `<namespace>::<element>'
// it is possible to create nested namespaces (!) `<nsA>::<nsB>::elm'
int math::dot(math::vec3i v, math::vec3i w) {
return v.x * w.x + v.y * w.y + v.z * w.z;
}
// alternatively (but not recommended) we can enclose the code
// in a namespace declaration
namespace math {
double dot(vec3d v, vec3d w) {
return v.x * w.x + v.y * w.y + v.z * w.z;
}
}
int main(int argc, char *argv[]) {
math::vec3i a = { 1, 2, 3 };
math::vec3i b = { 1, 2, 3 };
std::cout << math::dot(a, b) << std::endl;
// it is also possible to specify to implicitly
// always use the namespace in a scope
{
using namespace math;
vec3d c = { .5, .2, 11.2 };
vec3d d = { .2, .2, 12.3 };
std::cout << dot(c, d) << std::endl;
}
return 0;
}
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