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

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