libstdc++-v3/testsuite/25_algorithms/all_of/constrained.cc

   1 // Copyright (C) 2020-2025 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 run { target c++20 } }
  19
  20 #include <algorithm>
  21 #include <testsuite_hooks.h>
  22 #include <testsuite_iterators.h>
  23
  24 using __gnu_test::test_container;
  25 using __gnu_test::test_range;
  26 using __gnu_test::input_iterator_wrapper;
  27 using __gnu_test::forward_iterator_wrapper;
  28
  29 namespace ranges = std::ranges;
  30
  31 struct X { int i; };
  32
  33 struct XLess
  34 {
  35   int val;
  36   bool operator()(X& x) const { return x.i < val; }
  37 };
  38
  39 struct ILess
  40 {
  41   int val;
  42   bool operator()(int& i) const { return i < val; }
  43 };
  44
  45 template<typename T>
  46 struct NotZero
  47 {
  48   bool operator()(T& t) const { return t != 0; }
  49 };
  50
  51 void
  52 test01()
  53 {
  54   X x[] = { {2}, {4}, {6}, {8}, {10}, {11} };
  55
  56   VERIFY( ranges::all_of(x, x+5, XLess{11}) );
  57   VERIFY( ranges::all_of(x, x+5, ILess{11}, &X::i) );
  58   VERIFY( !ranges::all_of(x, x+6, ILess{11}, &X::i) );
  59   VERIFY( !ranges::all_of(x, XLess{11}) );
  60   VERIFY( ranges::all_of(x, XLess{12}) );
  61   VERIFY( ranges::all_of(x, ILess{12}, &X::i) );
  62   VERIFY( !ranges::all_of(x, ILess{11}, &X::i) );
  63
  64   test_container<X, forward_iterator_wrapper> c(x);
  65   VERIFY( ranges::all_of(c, NotZero<int>{}, &X::i) );
  66
  67   test_range<X, input_iterator_wrapper> r(x);
  68   VERIFY( ranges::all_of(r, NotZero<int>{}, &X::i) );
  69
  70   r.bounds.first = x;
  71   VERIFY( ranges::all_of(r, NotZero<X* const>{}, [](X& x) { return &x; }) );
  72 }
  73
  74 struct Y { int i; int j; };
  75
  76 void
  77 test02()
  78 {
  79   static constexpr Y y[] = { {1,2}, {2,4}, {3,6} };
  80   static_assert(ranges::all_of(y, [](int j) { return j%2 == 0; }, &Y::j));
  81   static_assert(ranges::all_of(y, [](const Y& y) { return y.j == y.i * 2; }));
  82 }
  83
  84 int
  85 main()
  86 {
  87   test01();
  88   test02();
  89 }