libstdc++-v3/testsuite/experimental/net/buffer/traits.cc

   1 // Copyright (C) 2015-2022 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile { target c++14 } }
  19
  20 #include <experimental/buffer>
  21
  22 using namespace std::experimental::net;
  23 using std::vector;
  24 using std::string;
  25 using std::char_traits;
  26 using std::allocator;
  27
  28 template<typename T>
  29 struct Seq {
  30   struct Buf {
  31     operator T() const { return {}; }
  32   };
  33
  34   Buf* begin() const { return nullptr; }
  35   Buf* end() const { return nullptr; }
  36 };
  37
  38 static_assert( is_mutable_buffer_sequence<mutable_buffer>::value,
  39     "mutable_buffer is a mutable buffer sequence" );
  40 static_assert( is_mutable_buffer_sequence<const mutable_buffer>::value,
  41     "const mutable_buffer is a mutable buffer sequence" );
  42 static_assert( is_mutable_buffer_sequence<vector<mutable_buffer>>::value,
  43     "vector<mutable_buffer> is a mutable buffer sequence" );
  44 static_assert( is_mutable_buffer_sequence<const vector<mutable_buffer>>::value,
  45     "const vector<mutable_buffer> is a mutable buffer sequence" );
  46 static_assert( is_mutable_buffer_sequence<Seq<mutable_buffer>>::value,
  47     "Seq<mutable_buffer> is a mutable buffer sequence" );
  48 static_assert( is_mutable_buffer_sequence<const Seq<mutable_buffer>>::value,
  49     "const Seq<mutable_buffer> is a mutable buffer sequence" );
  50 static_assert( is_mutable_buffer_sequence<Seq<const mutable_buffer>>::value,
  51     "Seq<const mutable_buffer> is a mutable buffer sequence" );
  52 static_assert( ! is_mutable_buffer_sequence<const_buffer>::value,
  53     "const_buffer is not a mutable buffer sequence" );
  54 static_assert( ! is_mutable_buffer_sequence<vector<const_buffer>>::value,
  55     "vector<const_buffer> is not a mutable buffer sequence" );
  56 static_assert( ! is_mutable_buffer_sequence<Seq<const_buffer>>::value,
  57     "Seq<const_buffer> is not a mutable buffer sequence" );
  58
  59 static_assert( is_const_buffer_sequence<const_buffer>::value,
  60     "const_buffer is a const buffer sequence" );
  61 static_assert( is_const_buffer_sequence<const const_buffer>::value,
  62     "const const_buffer is a const buffer sequence" );
  63 static_assert( is_const_buffer_sequence<vector<const_buffer>>::value,
  64     "vector<const_buffer> is a const buffer sequence" );
  65 static_assert( is_const_buffer_sequence<const vector<const_buffer>>::value,
  66     "const vector<const_buffer> is a const buffer sequence" );
  67 static_assert( is_const_buffer_sequence<Seq<const_buffer>>::value,
  68     "Seq<const_buffer> is a const buffer sequence" );
  69 static_assert( is_const_buffer_sequence<const Seq<const_buffer>>::value,
  70     "const Seq<const_buffer> is a const buffer sequence" );
  71 static_assert( is_const_buffer_sequence<Seq<const const_buffer>>::value,
  72     "Seq<const const_buffer> is a const buffer sequence" );
  73 static_assert( is_const_buffer_sequence<mutable_buffer>::value,
  74     "mutable_buffer is a const buffer sequence" );
  75 static_assert( is_const_buffer_sequence<const mutable_buffer>::value,
  76     "const mutable_buffer is a const buffer sequence" );
  77 static_assert( is_const_buffer_sequence<vector<mutable_buffer>>::value,
  78     "vector<mutable_buffer> is a const buffer sequence" );
  79 static_assert( is_const_buffer_sequence<const vector<mutable_buffer>>::value,
  80     "const vector<mutable_buffer> is a const buffer sequence" );
  81
  82 // Buf -> mutable_buffer -> const_buffer needs two user-defined conversions:
  83 static_assert( ! is_const_buffer_sequence<Seq<mutable_buffer>>::value,
  84     "Seq<mutable_buffer> is not a const buffer sequence" );
  85
  86 static_assert( is_dynamic_buffer<
  87     dynamic_vector_buffer<int, allocator<int>>
  88     >::value, "dynamic_vector_buffer is a dynamic buffer" );
  89 static_assert( is_dynamic_buffer<
  90     dynamic_string_buffer<char, char_traits<char>, allocator<int>>
  91     >::value, "dynamic_string_buffer is a dynamic buffer" );
  92 static_assert( ! is_dynamic_buffer<vector<int>>::value,
  93     "vector is not a dynamic buffer" );
  94 static_assert( ! is_dynamic_buffer<string>::value,
  95     "string is not a dynamic buffer" );