xref: /external/libcxx/test/numerics/numarray/template.slice.array/slice.arr.comp.assign/subtraction.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <valarray>

// template <class T> class slice_array

// void operator-= (const valarray<value_type>& v) const;

#include <valarray>
#include <cassert>

int main()
{
    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] ==  2);
    assert(v1[ 2] ==  2);
    assert(v1[ 3] ==  3);
    assert(v1[ 4] ==  6);
    assert(v1[ 5] ==  5);
    assert(v1[ 6] ==  6);
    assert(v1[ 7] == 10);
    assert(v1[ 8] ==  8);
    assert(v1[ 9] ==  9);
    assert(v1[10] == 14);
    assert(v1[11] == 11);
    assert(v1[12] == 12);
    assert(v1[13] == 18);
    assert(v1[14] == 14);
    assert(v1[15] == 15);
}