//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Test the mandates
// template<class F> constexpr auto or_else(F&& f) &;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
// template<class F> constexpr auto or_else(F&& f) const &;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
// template<class F> constexpr auto or_else(F&& f) &&;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
// template<class F> constexpr auto or_else(F&& f) const &&;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
#include <expected>
#include <utility>
struct NotSameAsInt {};
int lval_return_not_std_expected(int&) { return 0; }
int clval_return_not_std_expected(const int&) { return 0; }
int rval_return_not_std_expected(int&&) { return 0; }
int crval_return_not_std_expected(const int&&) { return 0; }
std::expected<NotSameAsInt, int> lval_error_type_not_same_as_int(int&) { return {}; }
std::expected<NotSameAsInt, int> clval_error_type_not_same_as_int(const int&) { return {}; }
std::expected<NotSameAsInt, int> rval_error_type_not_same_as_int(int&&) { return {}; }
std::expected<NotSameAsInt, int> crval_error_type_not_same_as_int(const int&&) { return {}; }
// clang-format off
void test() {
// Test & overload
{
// G is not a specialization of std::expected
{
std::expected<void, int> f1(std::unexpected<int>(1));
f1.or_else(lval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<int (&)(int &)>' requested here}}
// expected-error-re@*:* {{static assertion failed {{.*}}The result of f(error()) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
}
// !std::is_same_v<G:value_type, T>
{
std::expected<void, int> f1(std::unexpected<int>(1));
f1.or_else(lval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<std::expected<NotSameAsInt, int> (&)(int &)>' requested here}}
// expected-error-re@*:* {{static assertion failed {{.*}}The result of f(error()) must have the same value_type as this expected}}
}
}
// Test const& overload
{
// G is not a specialization of std::expected
{
const std::expected<void, int> f1(std::unexpected<int>(1));
f1.or_else(clval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<int (&)(const int &)>' requested here}}
// expected-error-re@*:* {{static assertion failed {{.*}}The result of f(error()) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
}
// !std::is_same_v<G:value_type, T>
{
const std::expected<void, int> f1(std::unexpected<int>(1));
f1.or_else(clval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<std::expected<NotSameAsInt, int> (&)(const int &)>' requested here}}
// expected-error-re@*:* {{static assertion failed {{.*}}The result of f(error()) must have the same value_type as this expected}}
}
}
// Test && overload
{
// G is not a specialization of std::expected
{
std::expected<void, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(rval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<int (&)(int &&)>' requested here}}
// expected-error-re@*:* {{static assertion failed {{.*}}The result of f(std::move(error())) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
}
// !std::is_same_v<G:value_type, T>
{
std::expected<void, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(rval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<std::expected<NotSameAsInt, int> (&)(int &&)>' requested here}}
// expected-error-re@*:* {{static assertion failed {{.*}}The result of f(std::move(error())) must have the same value_type as this expected}}
}
}
// Test const&& overload
{
// G is not a specialization of std::expected
{
const std::expected<void, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(crval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<int (&)(const int &&)>' requested here}}
// expected-error-re@*:* {{static assertion failed {{.*}}The result of f(std::move(error())) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
}
// !std::is_same_v<G:value_type, T>
{
const std::expected<void, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(crval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<std::expected<NotSameAsInt, int> (&)(const int &&)>' requested here}}
// expected-error-re@*:* {{static assertion failed {{.*}}The result of f(std::move(error())) must have the same value_type as this expected}}
}
}
}
// clang-format on
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