58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <valarray>
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// template<class T> class valarray;
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// valarray operator[](const valarray<size_t>& vs) const;
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#include <valarray>
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#include <cassert>
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int main()
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{
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int a[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
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12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
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36, 37, 38, 39, 40};
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const std::size_t N1 = sizeof(a)/sizeof(a[0]);
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std::size_t s[] = { 3, 4, 5, 7, 8, 9, 11, 12, 13, 15, 16, 17,
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22, 23, 24, 26, 27, 28, 30, 31, 32, 34, 35, 36};
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const std::size_t S = sizeof(s)/sizeof(s[0]);
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const std::valarray<int> v1(a, N1);
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std::valarray<std::size_t> ia(s, S);
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std::valarray<int> v = v1[ia];
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assert(v.size() == 24);
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assert(v[ 0] == 3);
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assert(v[ 1] == 4);
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assert(v[ 2] == 5);
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assert(v[ 3] == 7);
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assert(v[ 4] == 8);
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assert(v[ 5] == 9);
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assert(v[ 6] == 11);
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assert(v[ 7] == 12);
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assert(v[ 8] == 13);
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assert(v[ 9] == 15);
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assert(v[10] == 16);
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assert(v[11] == 17);
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assert(v[12] == 22);
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assert(v[13] == 23);
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assert(v[14] == 24);
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assert(v[15] == 26);
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assert(v[16] == 27);
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assert(v[17] == 28);
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assert(v[18] == 30);
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assert(v[19] == 31);
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assert(v[20] == 32);
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assert(v[21] == 34);
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assert(v[22] == 35);
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assert(v[23] == 36);
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}
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