expected/tests/issues.cpp

#include <catch2/catch.hpp>
#include <tl/expected.hpp>

#include <string>

using std::string;

tl::expected<int, string> getInt3(int val) { return val; }

tl::expected<int, string> getInt2(int val) { return val; }

tl::expected<int, string> getInt1() { return getInt2(5).and_then(getInt3); }

TEST_CASE("Issue 1", "[issues.1]") { getInt1(); }

tl::expected<int, int> operation1() { return 42; }

tl::expected<std::string, int> operation2(int const val) { return "Bananas"; }

TEST_CASE("Issue 17", "[issues.17]") {
  auto const intermediate_result = operation1();

  intermediate_result.and_then(operation2);
}

struct a {};
struct b : a {};

auto doit() -> tl::expected<std::unique_ptr<b>, int> {
    return tl::make_unexpected(0);
}

TEST_CASE("Issue 23", "[issues.23]") {
    tl::expected<std::unique_ptr<a>, int> msg = doit();
    REQUIRE(!msg.has_value());    
}

TEST_CASE("Issue 26", "[issues.26]") {
  tl::expected<a, int> exp = tl::expected<b, int>(tl::unexpect, 0);
  REQUIRE(!exp.has_value());
}

struct foo {
  foo() = default;
  foo(foo &) = delete;
  foo(foo &&){};
};

TEST_CASE("Issue 29", "[issues.29]") {
  std::vector<foo> v;
  v.emplace_back();
  tl::expected<std::vector<foo>, int> ov = std::move(v);
  REQUIRE(ov->size() == 1);
}

tl::expected<int, std::string> error() {
  return tl::make_unexpected(std::string("error1 "));
}
std::string maperror(std::string s) { return s + "maperror "; }

TEST_CASE("Issue 30", "[issues.30]") {
  error().map_error(maperror);
}

struct i31{
  int i;
};
TEST_CASE("Issue 31", "[issues.31]") {
    const tl::expected<i31, int> a = i31{42};
    a->i;

    tl::expected< void, std::string > result;
    tl::expected< void, std::string > result2 = result;
    result2 = result;
}

TEST_CASE("Issue 33", "[issues.33]") {
    tl::expected<void, int> res {tl::unexpect, 0};
    REQUIRE(!res);    
    res = res.map_error([](int i) { return 42; });
    REQUIRE(res.error() == 42);
}


tl::expected<void, std::string> voidWork() { return {}; }
tl::expected<int, std::string> work2() { return 42; }
void errorhandling(std::string){}

TEST_CASE("Issue 34", "[issues.34]") {
  tl::expected <int, std::string> result = voidWork ()
      .and_then (work2);
  result.map_error ([&] (std::string result) {errorhandling (result);});
}

struct non_copyable {
	non_copyable(non_copyable&&) = default;
	non_copyable(non_copyable const&) = delete;
	non_copyable() = default;
};

TEST_CASE("Issue 42", "[issues.42]") {
	tl::expected<non_copyable,int>{}.map([](non_copyable) {});
}

TEST_CASE("Issue 43", "[issues.43]") {
	auto result = tl::expected<void, std::string>{};
	result = tl::make_unexpected(std::string{ "foo" });
}

#if !(__GNUC__ <= 5)
#include <memory>

using MaybeDataPtr = tl::expected<int, std::unique_ptr<int>>;

MaybeDataPtr test(int i) noexcept
{
  return std::move(i);
}

MaybeDataPtr test2(int i) noexcept
{
  return std::move(i);
}

TEST_CASE("Issue 49", "[issues.49]") {
  auto m = test(10)
    .and_then(test2);
}
#endif

tl::expected<int, std::unique_ptr<std::string>> func()
{
  return 1;
}

TEST_CASE("Issue 61", "[issues.61]") {
  REQUIRE(func().value() == 1);
}