000940e296
The tests were a bit of a mess -- the testing coverage wasn't bad but it was extremely difficult to see what was being tested and where. I split up the tests to make them easier to audit for completeness and did such an audit, adding a few missing tests (e.g. the conditional noexcept-ness of std::cbegin and std::cend). I also audited the synopsis and adjusted it where it needed to be adjusted. This patch is in preparation of fixing #67471.
94 lines
3.2 KiB
C++
94 lines
3.2 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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// UNSUPPORTED: c++03
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// Make sure that std::cbegin(x) effectively calls std::as_const(x).begin(), not x.cbegin().
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//
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// Also make sure that we don't get hijacked by ADL, see https://llvm.org/PR28927.
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#include <cassert>
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#include <iterator>
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#include "test_macros.h"
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struct ArrayHijacker {
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friend constexpr int begin(ArrayHijacker (&)[3]) { return 42; }
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friend constexpr int end(ArrayHijacker (&)[3]) { return 42; }
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friend constexpr int begin(const ArrayHijacker (&)[3]) { return 42; }
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friend constexpr int end(const ArrayHijacker (&)[3]) { return 42; }
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};
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struct ContainerHijacker {
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int* a_;
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constexpr int* begin() const { return a_; }
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constexpr int* end() const { return a_ + 3; }
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constexpr int* rbegin() const { return a_; }
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constexpr int* rend() const { return a_ + 3; }
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friend constexpr int begin(ContainerHijacker&) { return 42; }
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friend constexpr int end(ContainerHijacker&) { return 42; }
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friend constexpr int begin(const ContainerHijacker&) { return 42; }
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friend constexpr int end(const ContainerHijacker&) { return 42; }
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friend constexpr int cbegin(ContainerHijacker&) { return 42; }
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friend constexpr int cend(ContainerHijacker&) { return 42; }
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friend constexpr int cbegin(const ContainerHijacker&) { return 42; }
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friend constexpr int cend(const ContainerHijacker&) { return 42; }
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friend constexpr int rbegin(ContainerHijacker&) { return 42; }
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friend constexpr int rend(ContainerHijacker&) { return 42; }
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friend constexpr int rbegin(const ContainerHijacker&) { return 42; }
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friend constexpr int rend(const ContainerHijacker&) { return 42; }
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friend constexpr int crbegin(ContainerHijacker&) { return 42; }
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friend constexpr int crend(ContainerHijacker&) { return 42; }
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friend constexpr int crbegin(const ContainerHijacker&) { return 42; }
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friend constexpr int crend(const ContainerHijacker&) { return 42; }
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};
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TEST_CONSTEXPR_CXX17 bool test() {
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{
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ArrayHijacker a[3] = {};
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assert(begin(a) == 42);
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assert(end(a) == 42);
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assert(std::begin(a) == a);
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assert(std::end(a) == a + 3);
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#if TEST_STD_VER > 11
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assert(std::cbegin(a) == a);
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assert(std::cend(a) == a + 3);
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assert(std::rbegin(a).base() == a + 3);
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assert(std::rend(a).base() == a);
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assert(std::crbegin(a).base() == a + 3);
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assert(std::crend(a).base() == a);
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#endif
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}
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{
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int a[3] = {};
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ContainerHijacker c{a};
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assert(begin(c) == 42);
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assert(end(c) == 42);
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assert(std::begin(c) == a);
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assert(std::end(c) == a + 3);
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#if TEST_STD_VER > 11
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assert(std::cbegin(c) == a);
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assert(std::cend(c) == a + 3);
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assert(std::rbegin(c) == a);
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assert(std::rend(c) == a + 3);
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assert(std::crbegin(c) == a);
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assert(std::crend(c) == a + 3);
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#endif
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}
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return true;
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}
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int main(int, char**) {
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test();
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#if TEST_STD_VER >= 17
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static_assert(test());
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#endif
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return 0;
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}
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