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-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14
10
11// <map>
12
13// template<class InputIterator,
14// class Compare = less<iter-value-type<InputIterator>>,
15// class Allocator = allocator<iter-value-type<InputIterator>>>
16// multimap(InputIterator, InputIterator,
17// Compare = Compare(), Allocator = Allocator())
18// -> multimap<iter-value-type<InputIterator>, Compare, Allocator>;
19// template<class Key, class Compare = less<Key>, class Allocator = allocator<Key>>
20// multimap(initializer_list<Key>, Compare = Compare(), Allocator = Allocator())
21// -> multimap<Key, Compare, Allocator>;
22// template<class InputIterator, class Allocator>
23// multimap(InputIterator, InputIterator, Allocator)
24// -> multimap<iter-value-type<InputIterator>, less<iter-value-type<InputIterator>>, Allocator>;
25// template<class Key, class Allocator>
26// multimap(initializer_list<Key>, Allocator)
27// -> multimap<Key, less<Key>, Allocator>;
28
29#include <climits> // INT_MAX
30#include <functional>
31#include <map>
32#include <type_traits>
33
34struct NotAnAllocator {
35 friend bool operator<(NotAnAllocator, NotAnAllocator) { return false; }
36};
37
38using P = std::pair<int, long>;
39using PC = std::pair<const int, long>;
40
41int main(int, char**)
42{
43 {
44 // cannot deduce Key and T from nothing
45 std::multimap m; // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
46 }
47 {
48 // cannot deduce Key and T from just (Compare)
49 std::multimap m(std::less<int>{});
50 // expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
51 }
52 {
53 // cannot deduce Key and T from just (Compare, Allocator)
54 std::multimap m(std::less<int>{}, std::allocator<PC>{});
55 // expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
56 }
57 {
58 // cannot deduce Key and T from just (Allocator)
59 std::multimap m(std::allocator<PC>{});
60 // expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
61 }
62 {
63 // refuse to rebind the allocator if Allocator::value_type is not exactly what we expect
64 const P arr[] = { {1,1L}, {2,2L}, {3,3L} };
65 std::multimap m(arr, arr + 3, std::allocator<P>());
66 // expected-error-re@map:* {{static assertion failed{{( due to requirement '.*')?}}{{.*}}Allocator::value_type must be same type as value_type}}
67 }
68 {
69 // cannot convert from some arbitrary unrelated type
70 NotAnAllocator a;
71 std::multimap m(a); // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
72 }
73 {
74 // cannot deduce that the inner braced things should be std::pair and not something else
75 std::multimap m{ {1,1L}, {2,2L}, {3,3L} };
76 // expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
77 }
78 {
79 // cannot deduce that the inner braced things should be std::pair and not something else
80 std::multimap m({ {1,1L}, {2,2L}, {3,3L} }, std::less<int>());
81 // expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
82 }
83 {
84 // cannot deduce that the inner braced things should be std::pair and not something else
85 std::multimap m({ {1,1L}, {2,2L}, {3,3L} }, std::less<int>(), std::allocator<PC>());
86 // expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
87 }
88 {
89 // cannot deduce that the inner braced things should be std::pair and not something else
90 std::multimap m({ {1,1L}, {2,2L}, {3,3L} }, std::allocator<PC>());
91 // expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
92 }
93 {
94 // since we have parens, not braces, this deliberately does not find the initializer_list constructor
95 std::multimap m(P{1,1L});
96 // expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
97 }
98 {
99 // since we have parens, not braces, this deliberately does not find the initializer_list constructor
100 std::multimap m(PC{1,1L});
101 // expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
102 }
103
104 return 0;
105}
106

source code of libcxx/test/std/containers/associative/multimap/multimap.cons/deduct.verify.cpp