libcxx/test/std/numerics/numarray/template.valarray/valarray.sub/slice_non_const.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <valarray>

// template<class T> class valarray;

// slice_array<value_type> operator[](slice s);

#include <valarray>
#include <cassert>

int main(int, char**)
{
    {
        int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
        int a2[] = {-1, -2, -3, -4, -5};
        std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
        std::valarray<int> v2(a2, sizeof(a2)/sizeof(a2[0]));
        v1[std::slice(1, 5, 3)] = v2;
        assert(v1.size() == 16);
        assert(v1[ 0] ==  0);
        assert(v1[ 1] == -1);
        assert(v1[ 2] ==  2);
        assert(v1[ 3] ==  3);
        assert(v1[ 4] == -2);
        assert(v1[ 5] ==  5);
        assert(v1[ 6] ==  6);
        assert(v1[ 7] == -3);
        assert(v1[ 8] ==  8);
        assert(v1[ 9] ==  9);
        assert(v1[10] == -4);
        assert(v1[11] == 11);
        assert(v1[12] == 12);
        assert(v1[13] == -5);
        assert(v1[14] == 14);
        assert(v1[15] == 15);
    }
    {
        int a1[] = {0, 1, 2, 3, 4, 5};
        std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
        std::valarray<int> v2((v1 + 0)[std::slice(0, 3, 2)]);
        assert(v2.size() == 3);
        assert(v2[0] == 0);
        assert(v2[1] == 2);
        assert(v2[2] == 4);
    }
  return 0;
}