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 // <valarray> 11 12 // template<class T> class valarray; 13 14 // valarray operator[](const valarray<size_t>& vs) const; 15 16 #include <valarray> 17 #include <cassert> 18 19 int main() 20 { 21 int a[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 22 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 23 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 24 36, 37, 38, 39, 40}; 25 const std::size_t N1 = sizeof(a)/sizeof(a[0]); 26 std::size_t s[] = { 3, 4, 5, 7, 8, 9, 11, 12, 13, 15, 16, 17, 27 22, 23, 24, 26, 27, 28, 30, 31, 32, 34, 35, 36}; 28 const std::size_t S = sizeof(s)/sizeof(s[0]); 29 const std::valarray<int> v1(a, N1); 30 std::valarray<std::size_t> ia(s, S); 31 std::valarray<int> v = v1[ia]; 32 assert(v.size() == 24); 33 assert(v[ 0] == 3); 34 assert(v[ 1] == 4); 35 assert(v[ 2] == 5); 36 assert(v[ 3] == 7); 37 assert(v[ 4] == 8); 38 assert(v[ 5] == 9); 39 assert(v[ 6] == 11); 40 assert(v[ 7] == 12); 41 assert(v[ 8] == 13); 42 assert(v[ 9] == 15); 43 assert(v[10] == 16); 44 assert(v[11] == 17); 45 assert(v[12] == 22); 46 assert(v[13] == 23); 47 assert(v[14] == 24); 48 assert(v[15] == 26); 49 assert(v[16] == 27); 50 assert(v[17] == 28); 51 assert(v[18] == 30); 52 assert(v[19] == 31); 53 assert(v[20] == 32); 54 assert(v[21] == 34); 55 assert(v[22] == 35); 56 assert(v[23] == 36); 57 } 58
