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Merged
X1aomu merged 2 commits into from
Apr 22, 2024
Merged

Workaround of compilation error for VS 2019 #7

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a0868d5
test: more tests
X1aomu Apr 19, 2024
82ed513
fix: compiler errors with msvc v142
X1aomu Apr 19, 2024
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16 changes: 8 additions & 8 deletions include/zeus/expected.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2441,7 +2441,7 @@ class expected<void, E>
constexpr auto and_then(F &&f) &
{
using U = expected_detail::remove_cvref_t<std::invoke_result_t<F>>;
static_assert(expected_detail::is_specialization_v<U, expected>, "U (return type of F) must be specialization of expected");
static_assert(expected_detail::is_specialization_v<U, zeus::expected>, "U (return type of F) must be specialization of expected");
static_assert(std::is_same_v<typename U::error_type, E>, "The error type must be the same after calling the F");

if (has_value())
Expand All @@ -2453,7 +2453,7 @@ class expected<void, E>
constexpr auto and_then(F &&f) const &
{
using U = expected_detail::remove_cvref_t<std::invoke_result_t<F>>;
static_assert(expected_detail::is_specialization_v<U, expected>, "U (return type of F) must be specialization of expected");
static_assert(expected_detail::is_specialization_v<U, zeus::expected>, "U (return type of F) must be specialization of expected");
static_assert(std::is_same_v<typename U::error_type, E>, "The error type must be the same after calling the F");

if (has_value())
Expand All @@ -2465,7 +2465,7 @@ class expected<void, E>
constexpr auto and_then(F &&f) &&
{
using U = expected_detail::remove_cvref_t<std::invoke_result_t<F>>;
static_assert(expected_detail::is_specialization_v<U, expected>, "U (return type of F) must be specialization of expected");
static_assert(expected_detail::is_specialization_v<U, zeus::expected>, "U (return type of F) must be specialization of expected");
static_assert(std::is_same_v<typename U::error_type, E>, "The error type must be the same after calling the F");

if (has_value())
Expand All @@ -2477,7 +2477,7 @@ class expected<void, E>
constexpr auto and_then(F &&f) const &&
{
using U = expected_detail::remove_cvref_t<std::invoke_result_t<F>>;
static_assert(expected_detail::is_specialization_v<U, expected>, "U (return type of F) must be specialization of expected");
static_assert(expected_detail::is_specialization_v<U, zeus::expected>, "U (return type of F) must be specialization of expected");
static_assert(std::is_same_v<typename U::error_type, E>, "The error type must be the same after calling the F");

if (has_value())
Expand All @@ -2490,7 +2490,7 @@ class expected<void, E>
constexpr auto or_else(F &&f) &
{
using G = expected_detail::remove_cvref_t<std::invoke_result_t<F, decltype(error())>>;
static_assert(expected_detail::is_specialization_v<G, expected>, "G (return type of F) must be specialization of expected");
static_assert(expected_detail::is_specialization_v<G, zeus::expected>, "G (return type of F) must be specialization of expected");
static_assert(std::is_same_v<typename G::value_type, T>, "The value type must be the same after calling the F");

if (has_value())
Expand All @@ -2502,7 +2502,7 @@ class expected<void, E>
constexpr auto or_else(F &&f) const &
{
using G = expected_detail::remove_cvref_t<std::invoke_result_t<F, decltype(error())>>;
static_assert(expected_detail::is_specialization_v<G, expected>, "G (return type of F) must be specialization of expected");
static_assert(expected_detail::is_specialization_v<G, zeus::expected>, "G (return type of F) must be specialization of expected");
static_assert(std::is_same_v<typename G::value_type, T>, "The value type must be the same after calling the F");

if (has_value())
Expand All @@ -2514,7 +2514,7 @@ class expected<void, E>
constexpr auto or_else(F &&f) &&
{
using G = expected_detail::remove_cvref_t<std::invoke_result_t<F, decltype(std::move(error()))>>;
static_assert(expected_detail::is_specialization_v<G, expected>, "G (return type of F) must be specialization of expected");
static_assert(expected_detail::is_specialization_v<G, zeus::expected>, "G (return type of F) must be specialization of expected");
static_assert(std::is_same_v<typename G::value_type, T>, "The value type must be the same after calling the F");

if (has_value())
Expand All @@ -2526,7 +2526,7 @@ class expected<void, E>
constexpr auto or_else(F &&f) const &&
{
using G = expected_detail::remove_cvref_t<std::invoke_result_t<F, decltype(std::move(error()))>>;
static_assert(expected_detail::is_specialization_v<G, expected>, "G (return type of F) must be specialization of expected");
static_assert(expected_detail::is_specialization_v<G, zeus::expected>, "G (return type of F) must be specialization of expected");
static_assert(std::is_same_v<typename G::value_type, T>, "The value type must be the same after calling the F");

if (has_value())
Expand Down
57 changes: 57 additions & 0 deletions tests/test_expected/monadic_tests.cpp
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
#include <string>
#include <type_traits>

#include <catch2/catch_all.hpp>

Expand Down Expand Up @@ -30,3 +31,59 @@ TEST_CASE("and_then()", "[monadic]")
static_assert(std::is_same_v<std::remove_cv_t<decltype(newVal)>, Expected2>);
}
}

TEST_CASE("void-T and_then()", "[monadic, void-T]")
{
using T = std::string;
using Expected = expected<void, T>;

{ // non-void
using Expected2 = expected<double, T>;

Expected e {};

auto const newVal = e.and_then([]() { return Expected2 {}; });

static_assert(std::is_same_v<std::remove_cv_t<decltype(newVal)>, Expected2>);
}
{ // void
using Expected2 = expected<void, T>;

Expected e {};

auto const newVal = e.and_then([]() -> Expected2 { return Expected2 {}; });

static_assert(std::is_same_v<std::remove_cv_t<decltype(newVal)>, Expected2>);
}
}

TEST_CASE("or_else()", "[monadic]")
{
using T = std::string;
using Expected = expected<T, int>;

{ // non-void
using Expected2 = expected<T, double>;

Expected e {};

auto const newVal = e.or_else([](auto&&) { return Expected2 {}; });

static_assert(std::is_same_v<std::remove_cv_t<decltype(newVal)>, Expected2>);
}
}

TEST_CASE("void-T or_else()", "[monadic, void-T]")
{
using Expected = expected<void, int>;

{ // non-void
using Expected2 = expected<void, double>;

Expected e {};

auto const newVal = e.or_else([](auto&&) { return Expected2 {}; });

static_assert(std::is_same_v<std::remove_cv_t<decltype(newVal)>, Expected2>);
}
}