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#include "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
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