70 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++1410 11// <set>12 13// template<class InputIterator,14// class Compare = less<iter-value-type<InputIterator>>,15// class Allocator = allocator<iter-value-type<InputIterator>>>16// multiset(InputIterator, InputIterator,17// Compare = Compare(), Allocator = Allocator())18// -> multiset<iter-value-type<InputIterator>, Compare, Allocator>;19// template<class Key, class Compare = less<Key>,20// class Allocator = allocator<Key>>21// multiset(initializer_list<Key>, Compare = Compare(), Allocator = Allocator())22// -> multiset<Key, Compare, Allocator>;23// template<class InputIterator, class Allocator>24// multiset(InputIterator, InputIterator, Allocator)25// -> multiset<iter-value-type<InputIterator>,26// less<iter-value-type<InputIterator>>, Allocator>;27// template<class Key, class Allocator>28// multiset(initializer_list<Key>, Allocator)29// -> multiset<Key, less<Key>, Allocator>;30 31#include <functional>32#include <set>33#include <type_traits>34 35struct NotAnAllocator {36 friend bool operator<(NotAnAllocator, NotAnAllocator) { return false; }37};38 39int main(int, char**) {40 {41 // cannot deduce Key from nothing42 std::multiset s;43 // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}multiset'}}44 }45 {46 // cannot deduce Key from just (Compare)47 std::multiset s(std::less<int>{});48 // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}multiset'}}49 }50 {51 // cannot deduce Key from just (Compare, Allocator)52 std::multiset s(std::less<int>{}, std::allocator<int>{});53 // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}multiset'}}54 }55 {56 // cannot deduce Key from multiset(Allocator)57 std::multiset s(std::allocator<int>{});58 // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}multiset'}}59 }60 {61 // since we have parens, not braces, this deliberately does not find the62 // initializer_list constructor63 NotAnAllocator a;64 std::multiset s(a);65 // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}multiset'}}66 }67 68 return 0;69}70