5ca2777c69
The valarray<>::operator[](...) const functions return proxy objects. The valarray<>::operator[](...) functions return valarray objects. However the standard allows functions returning valarray objects to return custom proxy objects instead. Libc++ returns __val_expr proxies. Functions taking a valarray object must work with the custom proxies too. Therefore several operations have a custom proxy overload instead of valarray overloads. Libc++ doesn't specify a valarray overload. This is an issue with the standard proxy types; these can implicitly be converted to a valarray. The solution is to allow the standard proxies to behave as-if they are custom proxies. This patch fixes the valarray compound assignments. Other operations, like the binary non-member functions are not fixed. These will be done in a followup patch. Fixes: https://github.com/llvm/llvm-project/issues/21320
83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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& v);
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// [valarray.syn]/3
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// Any function returning a valarray<T> is permitted to return an object of
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// another type, provided all the const member functions of valarray<T> are
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// also applicable to this type.
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//
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// Libc++ uses this and returns __val_expr<_Expr> for several operations.
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//
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// The const overloads of
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// valarray::operator[](...) const
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// return propxy objects. These proxies are implicitly convertible to
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// std::valarray.
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//
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// Validate the function works for valarray, the proxies, and __val_expr.
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#include <valarray>
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#include <cassert>
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#include <cstddef>
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#include "test_macros.h"
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template <class A>
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void test(const A& rhs) {
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int input[] = {6, 14, 24, 36, 50};
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int expected[] = {1, 2, 3, 4, 5};
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const unsigned N = sizeof(input) / sizeof(input[0]);
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std::valarray<int> value(input, N);
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value /= rhs;
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assert(value.size() == N);
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for (std::size_t i = 0; i < value.size(); ++i)
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assert(value[i] == expected[i]);
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}
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int main(int, char**) {
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int input[] = {6, 7, 8, 9, 10};
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const unsigned N = sizeof(input) / sizeof(input[0]);
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std::valarray<bool> mask(true, N);
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std::size_t indices[] = {0, 1, 2, 3, 4};
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std::valarray<std::size_t> indirect(indices, N);
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std::valarray<int> zero(0, N);
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{
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std::valarray<int> value(input, N);
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test(value);
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test(value[std::slice(0, N, 1)]);
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test(value[std::gslice(0, std::valarray<std::size_t>(N, 1), std::valarray<std::size_t>(1, 1))]);
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test(value[mask]);
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test(value[indirect]);
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test(value + zero);
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}
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{
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const std::valarray<int> value(input, N);
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test(value);
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test(value[std::slice(0, N, 1)]);
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test(value[std::gslice(0, std::valarray<std::size_t>(N, 1), std::valarray<std::size_t>(1, 1))]);
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test(value[mask]);
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test(value[indirect]);
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test(value + zero);
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}
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return 0;
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}
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