libcxx/test/std/numerics/numarray/template.slice.array/slice.arr.assign/valarray.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 slice_array

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

#include <valarray>
#include <cassert>

#include "test_macros.h"

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]));
    std::slice_array<int> s1 = v1[std::slice(1, 5, 3)];
    s1 = 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);

    ASSERT_SAME_TYPE(decltype(s1 = v2), void);

// The initializer list constructor is disabled in C++03 mode.
#if TEST_STD_VER > 03
    std::valarray<double> m = { 0, 0, 0 };
    std::slice_array<double> s2 = m[std::slice(0, 3, 1)];
    s2 = { 1, 2, 3 };
    assert(m[0] == 1);
    assert(m[1] == 2);
    assert(m[2] == 3);

    ASSERT_SAME_TYPE(decltype(s2 = {1, 2, 3}), void);
#endif // TEST_STD_VER > 03

    return 0;
}