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, c++17, c++20
10
11// <flat_map>
12
13// Test CTAD on cases where deduction should fail.
14
15#include <array>
16#include <flat_map>
17#include <functional>
18#include <tuple>
19#include <utility>
20
21struct NotAnAllocator {
22 friend bool operator<(NotAnAllocator, NotAnAllocator) { return false; }
23};
24
25using P = std::pair<int, long>;
26using PC = std::pair<const int, long>;
27
28void test() {
29 {
30 // cannot deduce that the inner braced things should be std::pair and not something else
31 std::flat_multimap m{{1, 1L}, {2, 2L}, {3, 3L}};
32 // expected-error-re@-1{{{{no viable constructor or deduction guide for deduction of template arguments of '.*flat_multimap'}}}}
33 }
34 {
35 // cannot deduce that the inner braced things should be std::pair and not something else
36 std::flat_multimap m({{1, 1L}, {2, 2L}, {3, 3L}}, std::less<int>());
37 // expected-error-re@-1{{{{no viable constructor or deduction guide for deduction of template arguments of '.*flat_multimap'}}}}
38 }
39 {
40 // cannot deduce that the inner braced things should be std::pair and not something else
41 std::flat_multimap m({{1, 1L}, {2, 2L}, {3, 3L}}, std::less<int>(), std::allocator<PC>());
42 // expected-error-re@-1{{{{no viable constructor or deduction guide for deduction of template arguments of '.*flat_multimap'}}}}
43 }
44 {
45 // cannot deduce that the inner braced things should be std::pair and not something else
46 std::flat_multimap m({{1, 1L}, {2, 2L}, {3, 3L}}, std::allocator<PC>());
47 // expected-error-re@-1{{{{no viable constructor or deduction guide for deduction of template arguments of '.*flat_multimap'}}}}
48 }
49 {
50 // since we have parens, not braces, this deliberately does not find the initializer_list constructor
51 std::flat_multimap m(P{1, 1L});
52 // expected-error-re@-1{{{{no viable constructor or deduction guide for deduction of template arguments of '.*flat_multimap'}}}}
53 }
54 {
55 // since we have parens, not braces, this deliberately does not find the initializer_list constructor
56 std::flat_multimap m(PC{1, 1L});
57 // expected-error-re@-1{{{{no viable constructor or deduction guide for deduction of template arguments of '.*flat_multimap'}}}}
58 }
59 {
60 // cannot deduce from tuple-like objects without proper iterator
61 std::tuple<int, double> t{1, 2.0};
62 std::flat_multimap m(t);
63 // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}flat_multimap'}}
64 }
65 {
66 // cannot deduce from array-like objects without proper iterator
67 std::array<int, 2> arr{1, 2};
68 std::flat_multimap m(arr);
69 // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}flat_multimap'}}
70 }
71}
72

source code of libcxx/test/std/containers/container.adaptors/flat.multimap/flat.multimap.cons/deduct.verify.cpp