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#include "catch.hpp"
#include <tl/expected.hpp>
struct move_detector {
move_detector() = default;
move_detector(move_detector &&rhs) { rhs.been_moved = true; }
bool been_moved = false;
};
TEST_CASE("Observers", "[observers]") {
tl::expected<int,int> o1 = 42;
tl::expected<int,int> o2 {tl::unexpect, 0};
const tl::expected<int,int> o3 = 42;
REQUIRE(*o1 == 42);
REQUIRE(*o1 == o1.value());
REQUIRE(o2.value_or(42) == 42);
REQUIRE(o2.error() == 0);
REQUIRE(o3.value() == 42);
auto success = std::is_same<decltype(o1.value()), int &>::value;
REQUIRE(success);
success = std::is_same<decltype(o3.value()), const int &>::value;
REQUIRE(success);
success = std::is_same<decltype(std::move(o1).value()), int &&>::value;
REQUIRE(success);
#ifndef TL_EXPECTED_NO_CONSTRR
success = std::is_same<decltype(std::move(o3).value()), const int &&>::value;
REQUIRE(success);
#endif
tl::expected<move_detector,int> o4{tl::in_place};
move_detector o5 = std::move(o4).value();
REQUIRE(o4->been_moved);
REQUIRE(!o5.been_moved);
}
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