expected/tests/constructors.cpp

#include "catch.hpp"
#include "expected.hpp"

#include <vector>

struct takes_init_and_variadic {
    std::vector<int> v;
    std::tuple<int, int> t;
    template <class... Args>
    takes_init_and_variadic(std::initializer_list<int> l, Args &&... args)
        : v(l), t(std::forward<Args>(args)...) {}
};

TEST_CASE("Constructors", "[constructors]") {
    {
        tl::expected<int,int> e;
        REQUIRE(e);
        REQUIRE(e == 0);
    }

    {
        tl::expected<int,int> e = tl::make_unexpected(0);
        REQUIRE(!e);
        REQUIRE(e.error() == 0);
    }

    {
        tl::expected<int,int> e (tl::unexpect, 0);
        REQUIRE(!e);
        REQUIRE(e.error() == 0);
    }

    {
        tl::expected<int,int> e (tl::in_place, 42);
        REQUIRE(e);
        REQUIRE(e == 42);
    }

    {
        tl::expected<std::vector<int>,int> e (tl::in_place, {0,1});
        REQUIRE(e);
        REQUIRE((*e)[0] == 0);
        REQUIRE((*e)[1] == 1);
    }

    {
        tl::expected<std::tuple<int,int>,int> e (tl::in_place, 0, 1);
        REQUIRE(e);
        REQUIRE(std::get<0>(*e) == 0);
        REQUIRE(std::get<1>(*e) == 1);
    }

    {
        tl::expected<takes_init_and_variadic,int> e (tl::in_place, {0,1}, 2, 3);
        REQUIRE(e);
        REQUIRE(e->v[0] == 0);
        REQUIRE(e->v[1] == 1);
        REQUIRE(std::get<0>(e->t) == 2);
        REQUIRE(std::get<1>(e->t) == 3);
    }

}