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//===----------------------------------------------------------------------===//
//
// 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 and_then(F&& f) &;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F, decltype(value())>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
// template<class F> constexpr auto and_then(F&& f) const &;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F, decltype(value())>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
// template<class F> constexpr auto and_then(F&& f) &&;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F, decltype(value())>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
// template<class F> constexpr auto and_then(F&& f) const &&;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F, decltype(value())>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> 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<int, NotSameAsInt> lval_error_type_not_same_as_int(int&) { return {}; }
std::expected<int, NotSameAsInt> clval_error_type_not_same_as_int(const int&) { return {}; }
std::expected<int, NotSameAsInt> rval_error_type_not_same_as_int(int&&) { return {}; }
std::expected<int, NotSameAsInt> crval_error_type_not_same_as_int(const int&&) { return {}; }
// clang-format off
void test() {
// Test & overload
{
// U is not a specialization of std::expected
{
std::expected<int, int> f1(1);
f1.and_then(lval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<int (&)(int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(value()) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
std::expected<int, int> f1(1);
f1.and_then(lval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<std::expected<int, NotSameAsInt> (&)(int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(value()) must have the same error_type as this expected}}
}
}
// Test const& overload
{
// U is not a specialization of std::expected
{
const std::expected<int, int> f1(1);
f1.and_then(clval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<int (&)(const int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(value()) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
const std::expected<int, int> f1(1);
f1.and_then(clval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<std::expected<int, NotSameAsInt> (&)(const int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(value()) must have the same error_type as this expected}}
}
}
// Test && overload
{
// U is not a specialization of std::expected
{
std::expected<int, int> f1(1);
std::move(f1).and_then(rval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<int (&)(int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(value())) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
std::expected<int, int> f1(1);
std::move(f1).and_then(rval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<std::expected<int, NotSameAsInt> (&)(int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(value())) must have the same error_type as this expected}}
}
}
// Test const&& overload
{
// U is not a specialization of std::expected
{
const std::expected<int, int> f1(1);
std::move(f1).and_then(crval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<int (&)(const int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(value())) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
const std::expected<int, int> f1(1);
std::move(f1).and_then(crval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<std::expected<int, NotSameAsInt> (&)(const int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(value())) must have the same error_type as this expected}}
}
}
}
// clang-format on
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