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 // <algorithm> 10 11 // template<ForwardIterator Iter, Callable Generator> 12 // requires OutputIterator<Iter, Generator::result_type> 13 // && CopyConstructible<Generator> 14 // constexpr void // constexpr after c++17 15 // generate(Iter first, Iter last, Generator gen); 16 17 #include <algorithm> 18 #include <cassert> 19 20 #include "test_macros.h" 21 #include "test_iterators.h" 22 23 struct gen_test 24 { 25 TEST_CONSTEXPR int operator()() const {return 1;} 26 }; 27 28 29 #if TEST_STD_VER > 17 30 TEST_CONSTEXPR bool test_constexpr() { 31 int ia[] = {0, 1, 2, 3, 4}; 32 33 std::generate(std::begin(ia), std::end(ia), gen_test()); 34 35 return std::all_of(std::begin(ia), std::end(ia), [](int x) { return x == 1; }) 36 ; 37 } 38 #endif 39 40 41 template <class Iter> 42 void 43 test() 44 { 45 const unsigned n = 4; 46 int ia[n] = {0}; 47 std::generate(Iter(ia), Iter(ia+n), gen_test()); 48 assert(ia[0] == 1); 49 assert(ia[1] == 1); 50 assert(ia[2] == 1); 51 assert(ia[3] == 1); 52 } 53 54 int main() 55 { 56 test<forward_iterator<int*> >(); 57 test<bidirectional_iterator<int*> >(); 58 test<random_access_iterator<int*> >(); 59 test<int*>(); 60 61 #if TEST_STD_VER > 17 62 static_assert(test_constexpr()); 63 #endif 64 } 65