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      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 // <set>
     11 
     12 // void swap(set& c)
     13 //     noexcept(!allocator_type::propagate_on_container_swap::value ||
     14 //              __is_nothrow_swappable<allocator_type>::value);
     15 //
     16 //  In C++17, the standard says that swap shall have:
     17 //     noexcept(allocator_traits<Allocator>::is_always_equal::value &&
     18 //              noexcept(swap(declval<Compare&>(), declval<Compare&>())));
     19 
     20 // This tests a conforming extension
     21 
     22 #include <set>
     23 #include <cassert>
     24 
     25 #include "MoveOnly.h"
     26 #include "test_allocator.h"
     27 
     28 template <class T>
     29 struct some_comp
     30 {
     31     typedef T value_type;
     32 
     33     some_comp() {}
     34     some_comp(const some_comp&) {}
     35     void deallocate(void*, unsigned) {}
     36 
     37     typedef std::true_type propagate_on_container_swap;
     38 };
     39 
     40 template <class T>
     41 struct some_comp2
     42 {
     43     typedef T value_type;
     44 
     45     some_comp2() {}
     46     some_comp2(const some_comp2&) {}
     47     void deallocate(void*, unsigned) {}
     48     typedef std::true_type propagate_on_container_swap;
     49 };
     50 
     51 #if TEST_STD_VER >= 14
     52 template <typename T>
     53 void swap(some_comp2<T>&, some_comp2<T>&) noexcept {}
     54 #endif
     55 
     56 template <class T>
     57 struct some_alloc
     58 {
     59     typedef T value_type;
     60 
     61     some_alloc() {}
     62     some_alloc(const some_alloc&);
     63     void deallocate(void*, unsigned) {}
     64 
     65     typedef std::true_type propagate_on_container_swap;
     66 };
     67 
     68 template <class T>
     69 struct some_alloc2
     70 {
     71     typedef T value_type;
     72 
     73     some_alloc2() {}
     74     some_alloc2(const some_alloc2&);
     75     void deallocate(void*, unsigned) {}
     76 
     77     typedef std::false_type propagate_on_container_swap;
     78     typedef std::true_type is_always_equal;
     79 };
     80 
     81 template <class T>
     82 struct some_alloc3
     83 {
     84     typedef T value_type;
     85 
     86     some_alloc3() {}
     87     some_alloc3(const some_alloc3&);
     88     void deallocate(void*, unsigned) {}
     89 
     90     typedef std::false_type propagate_on_container_swap;
     91     typedef std::false_type is_always_equal;
     92 };
     93 
     94 int main()
     95 {
     96 #if __has_feature(cxx_noexcept)
     97     {
     98         typedef std::set<MoveOnly> C;
     99         C c1, c2;
    100         static_assert(noexcept(swap(c1, c2)), "");
    101     }
    102     {
    103         typedef std::set<MoveOnly, std::less<MoveOnly>, test_allocator<MoveOnly>> C;
    104         C c1, c2;
    105         static_assert(noexcept(swap(c1, c2)), "");
    106     }
    107     {
    108         typedef std::set<MoveOnly, std::less<MoveOnly>, other_allocator<MoveOnly>> C;
    109         C c1, c2;
    110         static_assert(noexcept(swap(c1, c2)), "");
    111     }
    112     {
    113         typedef std::set<MoveOnly, some_comp<MoveOnly>> C;
    114         C c1, c2;
    115         static_assert(!noexcept(swap(c1, c2)), "");
    116     }
    117 
    118 #if TEST_STD_VER >= 14
    119     { // POCS allocator, throwable swap for comp
    120     typedef std::set<MoveOnly, some_comp <MoveOnly>, some_alloc <MoveOnly>> C;
    121     C c1, c2;
    122     static_assert(!noexcept(swap(c1, c2)), "");
    123     }
    124     { // always equal allocator, throwable swap for comp
    125     typedef std::set<MoveOnly, some_comp <MoveOnly>, some_alloc2<MoveOnly>> C;
    126     C c1, c2;
    127     static_assert(!noexcept(swap(c1, c2)), "");
    128     }
    129     { // POCS allocator, nothrow swap for comp
    130     typedef std::set<MoveOnly, some_comp2<MoveOnly>, some_alloc <MoveOnly>> C;
    131     C c1, c2;
    132     static_assert( noexcept(swap(c1, c2)), "");
    133     }
    134     { // always equal allocator, nothrow swap for comp
    135     typedef std::set<MoveOnly, some_comp2<MoveOnly>, some_alloc2<MoveOnly>> C;
    136     C c1, c2;
    137     static_assert( noexcept(swap(c1, c2)), "");
    138     }
    139 
    140     { // NOT always equal allocator, nothrow swap for comp
    141     typedef std::set<MoveOnly, some_comp2<MoveOnly>, some_alloc3<MoveOnly>> C;
    142     C c1, c2;
    143     static_assert( noexcept(swap(c1, c2)), "");
    144     }
    145 #endif
    146 
    147 #endif
    148 }
    149