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 // <algorithm> 11 12 // template<ForwardIterator Iter, Callable Generator> 13 // requires OutputIterator<Iter, Generator::result_type> 14 // && CopyConstructible<Generator> 15 // constexpr void // constexpr after c++17 16 // generate(Iter first, Iter last, Generator gen); 17 18 #include <algorithm> 19 #include <cassert> 20 21 #include "test_macros.h" 22 #include "test_iterators.h" 23 24 struct gen_test 25 { 26 TEST_CONSTEXPR int operator()() const {return 1;} 27 }; 28 29 30 #if TEST_STD_VER > 17 31 TEST_CONSTEXPR bool test_constexpr() { 32 int ia[] = {0, 1, 2, 3, 4}; 33 34 std::generate(std::begin(ia), std::end(ia), gen_test()); 35 36 return std::all_of(std::begin(ia), std::end(ia), [](int x) { return x == 1; }) 37 ; 38 } 39 #endif 40 41 42 template <class Iter> 43 void 44 test() 45 { 46 const unsigned n = 4; 47 int ia[n] = {0}; 48 std::generate(Iter(ia), Iter(ia+n), gen_test()); 49 assert(ia[0] == 1); 50 assert(ia[1] == 1); 51 assert(ia[2] == 1); 52 assert(ia[3] == 1); 53 } 54 55 int main() 56 { 57 test<forward_iterator<int*> >(); 58 test<bidirectional_iterator<int*> >(); 59 test<random_access_iterator<int*> >(); 60 test<int*>(); 61 62 #if TEST_STD_VER > 17 63 static_assert(test_constexpr()); 64 #endif 65 } 66
