libcxx/test/std/containers/associative/multimap/multimap.cons/deduct.verify.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-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
  34 struct NotAnAllocator {
  35     friend bool operator<(NotAnAllocator, NotAnAllocator) { return false; }
  36 };
  37
  38 using P = std::pair<int, long>;
  39 using PC = std::pair<const int, long>;
  40
  41 int 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 }