83 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <valarray>10 11// template<class T> class valarray;12 13// valarray& operator%=(const valarray& v);14 15// [valarray.syn]/316// Any function returning a valarray<T> is permitted to return an object of17// another type, provided all the const member functions of valarray<T> are18// also applicable to this type.19//20// Libc++ uses this and returns __val_expr<_Expr> for several operations.21//22// The const overloads of23// valarray::operator[](...) const24// return proxy objects. These proxies are implicitly convertible to25// std::valarray.26//27// Validate the function works for valarray, the proxies, and __val_expr.28 29#include <valarray>30#include <cassert>31#include <cstddef>32 33#include "test_macros.h"34 35template <class A>36void test(const A& rhs) {37 int input[] = {6, 7, 8, 9, 10};38 int expected[] = {0, 1, 2, 1, 0};39 const unsigned N = sizeof(input) / sizeof(input[0]);40 std::valarray<int> value(input, N);41 42 value %= rhs;43 44 assert(value.size() == N);45 for (std::size_t i = 0; i < value.size(); ++i)46 assert(value[i] == expected[i]);47}48 49int main(int, char**) {50 int input[] = {1, 2, 3, 4, 5};51 const unsigned N = sizeof(input) / sizeof(input[0]);52 53 std::valarray<bool> mask(true, N);54 std::size_t indices[] = {0, 1, 2, 3, 4};55 std::valarray<std::size_t> indirect(indices, N);56 57 std::valarray<int> zero(0, N);58 59 {60 std::valarray<int> value(input, N);61 62 test(value);63 test(value[std::slice(0, N, 1)]);64 test(value[std::gslice(0, std::valarray<std::size_t>(N, 1), std::valarray<std::size_t>(1, 1))]);65 test(value[mask]);66 test(value[indirect]);67 test(value + zero);68 }69 70 {71 const std::valarray<int> value(input, N);72 73 test(value);74 test(value[std::slice(0, N, 1)]);75 test(value[std::gslice(0, std::valarray<std::size_t>(N, 1), std::valarray<std::size_t>(1, 1))]);76 test(value[mask]);77 test(value[indirect]);78 test(value + zero);79 }80 81 return 0;82}83