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e15dd4e32e
Summary: Freestanding is *weird*. The standard allows it to differ in a bunch of odd manners from regular C++, and the committee would like to improve that situation. I'd like to make libc++ behave better with what freestanding should be, so that it can be a tool we use in improving the standard. To do that we need to try stuff out, both with "freestanding the language mode" and "freestanding the library subset". Let's start with the super basic: run the libc++ tests in freestanding, using clang as the compiler, and see what works. The easiest hack to do this: In utils/libcxx/test/config.py add: self.cxx.compile_flags += ['-ffreestanding'] Run the tests and they all fail. Why? Because in freestanding `main` isn't special. This "not special" property has two effects: main doesn't get mangled, and main isn't allowed to omit its `return` statement. The first means main gets mangled and the linker can't create a valid executable for us to test. The second means we spew out warnings (ew) and the compiler doesn't insert the `return` we omitted, and main just falls of the end and does whatever undefined behavior (if you're luck, ud2 leading to non-zero return code). Let's start my work with the basics. This patch changes all libc++ tests to declare `main` as `int main(int, char**` so it mangles consistently (enabling us to declare another `extern "C"` main for freestanding which calls the mangled one), and adds `return 0;` to all places where it was missing. This touches 6124 files, and I apologize. The former was done with The Magic Of Sed. The later was done with a (not quite correct but decent) clang tool: https://gist.github.com/jfbastien/793819ff360baa845483dde81170feed This works for most tests, though I did have to adjust a few places when e.g. the test runs with `-x c`, macros are used for main (such as for the filesystem tests), etc. Once this is in we can create a freestanding bot which will prevent further regressions. After that, we can start the real work of supporting C++ freestanding fairly well in libc++. <rdar://problem/47754795> Reviewers: ldionne, mclow.lists, EricWF Subscribers: christof, jkorous, dexonsmith, arphaman, miyuki, libcxx-commits Differential Revision: https://reviews.llvm.org/D57624 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@353086 91177308-0d34-0410-b5e6-96231b3b80d8
265 lines
11 KiB
C++
265 lines
11 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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// type_traits
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// is_convertible
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#include <type_traits>
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#include "test_macros.h"
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template <class T, class U>
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void test_is_convertible()
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{
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static_assert((std::is_convertible<T, U>::value), "");
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static_assert((std::is_convertible<const T, U>::value), "");
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static_assert((std::is_convertible<T, const U>::value), "");
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static_assert((std::is_convertible<const T, const U>::value), "");
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#if TEST_STD_VER > 14
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static_assert((std::is_convertible_v<T, U>), "");
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static_assert((std::is_convertible_v<const T, U>), "");
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static_assert((std::is_convertible_v<T, const U>), "");
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static_assert((std::is_convertible_v<const T, const U>), "");
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#endif
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}
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template <class T, class U>
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void test_is_not_convertible()
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{
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static_assert((!std::is_convertible<T, U>::value), "");
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static_assert((!std::is_convertible<const T, U>::value), "");
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static_assert((!std::is_convertible<T, const U>::value), "");
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static_assert((!std::is_convertible<const T, const U>::value), "");
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#if TEST_STD_VER > 14
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static_assert((!std::is_convertible_v<T, U>), "");
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static_assert((!std::is_convertible_v<const T, U>), "");
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static_assert((!std::is_convertible_v<T, const U>), "");
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static_assert((!std::is_convertible_v<const T, const U>), "");
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#endif
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}
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typedef void Function();
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typedef void ConstFunction() const;
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typedef char Array[1];
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struct StringType {
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StringType(const char*) {}
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};
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class NonCopyable {
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NonCopyable(NonCopyable&);
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};
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template <typename T>
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class CannotInstantiate {
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enum { X = T::ThisExpressionWillBlowUp };
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};
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int main(int, char**)
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{
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// void
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test_is_convertible<void,void> ();
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test_is_not_convertible<void,Function> ();
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test_is_not_convertible<void,Function&> ();
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test_is_not_convertible<void,Function*> ();
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test_is_not_convertible<void,Array> ();
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test_is_not_convertible<void,Array&> ();
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test_is_not_convertible<void,char> ();
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test_is_not_convertible<void,char&> ();
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test_is_not_convertible<void,char*> ();
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test_is_not_convertible<char, void>();
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// Function
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test_is_not_convertible<Function, void> ();
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test_is_not_convertible<Function, Function> ();
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test_is_convertible<Function, Function&> ();
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test_is_convertible<Function, Function*> ();
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test_is_convertible<Function, Function*const> ();
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#if TEST_STD_VER >= 11
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static_assert(( std::is_convertible<Function, Function&&>::value), "");
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#endif
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test_is_not_convertible<Function, Array> ();
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test_is_not_convertible<Function, Array&> ();
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test_is_not_convertible<Function, char> ();
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test_is_not_convertible<Function, char&> ();
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test_is_not_convertible<Function, char*> ();
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// Function&
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test_is_not_convertible<Function&, void> ();
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test_is_not_convertible<Function&, Function> ();
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test_is_convertible<Function&, Function&> ();
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test_is_convertible<Function&, Function*> ();
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test_is_not_convertible<Function&, Array> ();
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test_is_not_convertible<Function&, Array&> ();
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test_is_not_convertible<Function&, char> ();
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test_is_not_convertible<Function&, char&> ();
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test_is_not_convertible<Function&, char*> ();
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// Function*
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test_is_not_convertible<Function*, void> ();
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test_is_not_convertible<Function*, Function> ();
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test_is_not_convertible<Function*, Function&> ();
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test_is_convertible<Function*, Function*> ();
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test_is_not_convertible<Function*, Array> ();
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test_is_not_convertible<Function*, Array&> ();
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test_is_not_convertible<Function*, char> ();
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test_is_not_convertible<Function*, char&> ();
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test_is_not_convertible<Function*, char*> ();
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// Non-referencable function type
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static_assert((!std::is_convertible<ConstFunction, Function>::value), "");
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static_assert((!std::is_convertible<ConstFunction, Function*>::value), "");
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static_assert((!std::is_convertible<ConstFunction, Function&>::value), "");
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#if TEST_STD_VER >= 11
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static_assert((!std::is_convertible<ConstFunction, Function&&>::value), "");
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#endif
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static_assert((!std::is_convertible<Function*, ConstFunction>::value), "");
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static_assert((!std::is_convertible<Function&, ConstFunction>::value), "");
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static_assert((!std::is_convertible<ConstFunction, ConstFunction>::value), "");
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static_assert((!std::is_convertible<ConstFunction, void>::value), "");
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// Array
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test_is_not_convertible<Array, void> ();
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test_is_not_convertible<Array, Function> ();
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test_is_not_convertible<Array, Function&> ();
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test_is_not_convertible<Array, Function*> ();
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test_is_not_convertible<Array, Array> ();
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static_assert((!std::is_convertible<Array, Array&>::value), "");
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static_assert(( std::is_convertible<Array, const Array&>::value), "");
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static_assert((!std::is_convertible<Array, const volatile Array&>::value), "");
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static_assert((!std::is_convertible<const Array, Array&>::value), "");
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static_assert(( std::is_convertible<const Array, const Array&>::value), "");
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static_assert((!std::is_convertible<Array, volatile Array&>::value), "");
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static_assert((!std::is_convertible<Array, const volatile Array&>::value), "");
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#if TEST_STD_VER >= 11
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static_assert(( std::is_convertible<Array, Array&&>::value), "");
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static_assert(( std::is_convertible<Array, const Array&&>::value), "");
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static_assert(( std::is_convertible<Array, volatile Array&&>::value), "");
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static_assert(( std::is_convertible<Array, const volatile Array&&>::value), "");
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static_assert(( std::is_convertible<const Array, const Array&&>::value), "");
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static_assert((!std::is_convertible<Array&, Array&&>::value), "");
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static_assert((!std::is_convertible<Array&&, Array&>::value), "");
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#endif
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test_is_not_convertible<Array, char> ();
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test_is_not_convertible<Array, char&> ();
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static_assert(( std::is_convertible<Array, char*>::value), "");
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static_assert(( std::is_convertible<Array, const char*>::value), "");
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static_assert(( std::is_convertible<Array, char* const>::value), "");
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static_assert(( std::is_convertible<Array, char* const volatile>::value), "");
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static_assert((!std::is_convertible<const Array, char*>::value), "");
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static_assert(( std::is_convertible<const Array, const char*>::value), "");
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static_assert((!std::is_convertible<char[42][42], char*>::value), "");
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static_assert((!std::is_convertible<char[][1], char*>::value), "");
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// Array&
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test_is_not_convertible<Array&, void> ();
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test_is_not_convertible<Array&, Function> ();
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test_is_not_convertible<Array&, Function&> ();
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test_is_not_convertible<Array&, Function*> ();
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test_is_not_convertible<Array&, Array> ();
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static_assert(( std::is_convertible<Array&, Array&>::value), "");
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static_assert(( std::is_convertible<Array&, const Array&>::value), "");
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static_assert((!std::is_convertible<const Array&, Array&>::value), "");
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static_assert(( std::is_convertible<const Array&, const Array&>::value), "");
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test_is_not_convertible<Array&, char> ();
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test_is_not_convertible<Array&, char&> ();
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static_assert(( std::is_convertible<Array&, char*>::value), "");
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static_assert(( std::is_convertible<Array&, const char*>::value), "");
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static_assert((!std::is_convertible<const Array&, char*>::value), "");
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static_assert(( std::is_convertible<const Array&, const char*>::value), "");
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static_assert((std::is_convertible<Array, StringType>::value), "");
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static_assert((std::is_convertible<char(&)[], StringType>::value), "");
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// char
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test_is_not_convertible<char, void> ();
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test_is_not_convertible<char, Function> ();
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test_is_not_convertible<char, Function&> ();
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test_is_not_convertible<char, Function*> ();
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test_is_not_convertible<char, Array> ();
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test_is_not_convertible<char, Array&> ();
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test_is_convertible<char, char> ();
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static_assert((!std::is_convertible<char, char&>::value), "");
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static_assert(( std::is_convertible<char, const char&>::value), "");
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static_assert((!std::is_convertible<const char, char&>::value), "");
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static_assert(( std::is_convertible<const char, const char&>::value), "");
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test_is_not_convertible<char, char*> ();
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// char&
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test_is_not_convertible<char&, void> ();
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test_is_not_convertible<char&, Function> ();
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test_is_not_convertible<char&, Function&> ();
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test_is_not_convertible<char&, Function*> ();
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test_is_not_convertible<char&, Array> ();
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test_is_not_convertible<char&, Array&> ();
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test_is_convertible<char&, char> ();
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static_assert(( std::is_convertible<char&, char&>::value), "");
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static_assert(( std::is_convertible<char&, const char&>::value), "");
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static_assert((!std::is_convertible<const char&, char&>::value), "");
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static_assert(( std::is_convertible<const char&, const char&>::value), "");
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test_is_not_convertible<char&, char*> ();
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// char*
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test_is_not_convertible<char*, void> ();
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test_is_not_convertible<char*, Function> ();
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test_is_not_convertible<char*, Function&> ();
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test_is_not_convertible<char*, Function*> ();
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test_is_not_convertible<char*, Array> ();
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test_is_not_convertible<char*, Array&> ();
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test_is_not_convertible<char*, char> ();
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test_is_not_convertible<char*, char&> ();
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static_assert(( std::is_convertible<char*, char*>::value), "");
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static_assert(( std::is_convertible<char*, const char*>::value), "");
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static_assert((!std::is_convertible<const char*, char*>::value), "");
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static_assert(( std::is_convertible<const char*, const char*>::value), "");
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// NonCopyable
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static_assert((std::is_convertible<NonCopyable&, NonCopyable&>::value), "");
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static_assert((std::is_convertible<NonCopyable&, const NonCopyable&>::value), "");
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static_assert((std::is_convertible<NonCopyable&, const volatile NonCopyable&>::value), "");
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static_assert((std::is_convertible<NonCopyable&, volatile NonCopyable&>::value), "");
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static_assert((std::is_convertible<const NonCopyable&, const NonCopyable&>::value), "");
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static_assert((std::is_convertible<const NonCopyable&, const volatile NonCopyable&>::value), "");
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static_assert((std::is_convertible<volatile NonCopyable&, const volatile NonCopyable&>::value), "");
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static_assert((std::is_convertible<const volatile NonCopyable&, const volatile NonCopyable&>::value), "");
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static_assert((!std::is_convertible<const NonCopyable&, NonCopyable&>::value), "");
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// This test requires Access control SFINAE which we only have in C++11 or when
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// we are using the compiler builtin for is_convertible.
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#if TEST_STD_VER >= 11 || !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK)
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test_is_not_convertible<NonCopyable&, NonCopyable>();
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#endif
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// Ensure that CannotInstantiate is not instantiated by is_convertible when it is not needed.
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// For example CannotInstantiate is instatiated as a part of ADL lookup for arguments of type CannotInstantiate*.
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static_assert((std::is_convertible<CannotInstantiate<int>*, CannotInstantiate<int>*>::value), "");
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return 0;
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}
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