libcruft-util/test/iterator.cpp

#include "../tap.hpp"

#include "../iterator.hpp"

#include <vector>
#include <array>


///////////////////////////////////////////////////////////////////////////////
int
main (int, char**)
{
    util::TAP::logger tap;

    // test that iteration across disparate types works as expected.
    //
    // the char array is an important element because it tends to decay to a
    // pointer type unless we're paying careful attention.
    {
        std::vector<int> v_int { 1, 2, 3 };
        std::array<float,3> a_float { 1.1f, 2.2f, 3.3f };
        char c_char[] = { '\0', 'b', 'c' };

        bool success = true;
        for (auto const &[i, v, a, c]: util::izip (v_int, a_float, c_char)) {
            success = success &&
                      v_int[i] == v &&
                      util::equal (a_float[i], a) &&
                      c_char[i] == c;
        }

        tap.expect (success, "izip containers of int, float, and char and an initialiser_list");
    }


    // test that the obvious structured binding syntax gives references to
    // the underlying values rather than silently supplying lvalues.
    //
    // we deliberately do not use any type of references in the range loop so
    // that we check the syntax a user is likely to employ actually works.
    // references may not be an obvious consideration.
    {
        const std::array<unsigned,3> src { 0, 1, 2 };
        std::array<unsigned,3> dst { 2, 0, 1 };

        for (auto [a,b]: util::zip (src, dst))
            b = a;

        tap.expect_eq (src, dst, "copy using structured bindings");
    }

    return tap.status ();
}