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      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<bool>& vb) const;
     15 
     16 #include <valarray>
     17 #include <cassert>
     18 
     19 int main()
     20 {
     21     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     22     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
     23     bool b[N1] = {true,  false, false, true,  true,  false,
     24                   false, true,  false, false, false, true};
     25     std::valarray<int> v1(a1, N1);
     26     std::valarray<bool> vb(b, N1);
     27     std::valarray<int> v2(v1[vb]);
     28     assert(v2.size() == 5);
     29     assert(v2[ 0] ==  0);
     30     assert(v2[ 1] ==  3);
     31     assert(v2[ 2] ==  4);
     32     assert(v2[ 3] ==  7);
     33     assert(v2[ 4] == 11);
     34 }
     35