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libcxx/test/std/utilities/meta/meta.rel/is_invocable.pass.cpp
JF Bastien e15dd4e32e Support tests in freestanding 
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
2019-02-04 20:31:13 +00:00

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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// type_traits
// is_invocable
// Most testing of is_invocable is done within the [meta.trans.other] result_of
// tests.
// Fn and all types in the template parameter pack ArgTypes shall be
// complete types, cv void, or arrays of unknown bound.
#include <type_traits>
#include <functional>
#include <memory>
#include <vector>
#include "test_macros.h"
struct Tag {};
struct DerFromTag : Tag {};
struct Implicit {
Implicit(int) {}
};
struct Explicit {
explicit Explicit(int) {}
};
struct NotCallableWithInt {
int operator()(int) = delete;
int operator()(Tag) { return 42; }
};
struct Sink {
template <class ...Args>
void operator()(Args&&...) const {}
};
int main(int, char**) {
using AbominableFunc = void(...) const;
// Non-callable things
{
static_assert(!std::is_invocable<void>::value, "");
static_assert(!std::is_invocable<const void>::value, "");
static_assert(!std::is_invocable<volatile void>::value, "");
static_assert(!std::is_invocable<const volatile void>::value, "");
static_assert(!std::is_invocable<std::nullptr_t>::value, "");
static_assert(!std::is_invocable<int>::value, "");
static_assert(!std::is_invocable<double>::value, "");
static_assert(!std::is_invocable<int[]>::value, "");
static_assert(!std::is_invocable<int[3]>::value, "");
static_assert(!std::is_invocable<int*>::value, "");
static_assert(!std::is_invocable<const int*>::value, "");
static_assert(!std::is_invocable<int const*>::value, "");
static_assert(!std::is_invocable<int&>::value, "");
static_assert(!std::is_invocable<const int&>::value, "");
static_assert(!std::is_invocable<int&&>::value, "");
static_assert(!std::is_invocable<std::vector<int> >::value, "");
static_assert(!std::is_invocable<std::vector<int*> >::value, "");
static_assert(!std::is_invocable<std::vector<int**> >::value, "");
static_assert(!std::is_invocable<AbominableFunc>::value, "");
// with parameters
static_assert(!std::is_invocable<int, int>::value, "");
static_assert(!std::is_invocable<int, double, float>::value, "");
static_assert(!std::is_invocable<int, char, float, double>::value, "");
static_assert(!std::is_invocable<Sink, AbominableFunc>::value, "");
static_assert(!std::is_invocable<Sink, void>::value, "");
static_assert(!std::is_invocable<Sink, const volatile void>::value,
"");
static_assert(!std::is_invocable_r<int, void>::value, "");
static_assert(!std::is_invocable_r<int, const void>::value, "");
static_assert(!std::is_invocable_r<int, volatile void>::value, "");
static_assert(!std::is_invocable_r<int, const volatile void>::value, "");
static_assert(!std::is_invocable_r<int, std::nullptr_t>::value, "");
static_assert(!std::is_invocable_r<int, int>::value, "");
static_assert(!std::is_invocable_r<int, double>::value, "");
static_assert(!std::is_invocable_r<int, int[]>::value, "");
static_assert(!std::is_invocable_r<int, int[3]>::value, "");
static_assert(!std::is_invocable_r<int, int*>::value, "");
static_assert(!std::is_invocable_r<int, const int*>::value, "");
static_assert(!std::is_invocable_r<int, int const*>::value, "");
static_assert(!std::is_invocable_r<int, int&>::value, "");
static_assert(!std::is_invocable_r<int, const int&>::value, "");
static_assert(!std::is_invocable_r<int, int&&>::value, "");
static_assert(!std::is_invocable_r<int, std::vector<int> >::value, "");
static_assert(!std::is_invocable_r<int, std::vector<int*> >::value, "");
static_assert(!std::is_invocable_r<int, std::vector<int**> >::value, "");
static_assert(!std::is_invocable_r<void, AbominableFunc>::value, "");
// with parameters
static_assert(!std::is_invocable_r<int, int, int>::value, "");
static_assert(!std::is_invocable_r<int, int, double, float>::value, "");
static_assert(!std::is_invocable_r<int, int, char, float, double>::value,
"");
static_assert(!std::is_invocable_r<void, Sink, AbominableFunc>::value, "");
static_assert(!std::is_invocable_r<void, Sink, void>::value, "");
static_assert(!std::is_invocable_r<void, Sink, const volatile void>::value,
"");
}
{
using Fn = int (Tag::*)(int);
using RFn = int (Tag::*)(int)&&;
// INVOKE bullet 1, 2 and 3
{
// Bullet 1
static_assert(std::is_invocable<Fn, Tag&, int>::value, "");
static_assert(std::is_invocable<Fn, DerFromTag&, int>::value, "");
static_assert(std::is_invocable<RFn, Tag&&, int>::value, "");
static_assert(!std::is_invocable<RFn, Tag&, int>::value, "");
static_assert(!std::is_invocable<Fn, Tag&>::value, "");
static_assert(!std::is_invocable<Fn, Tag const&, int>::value, "");
}
{
// Bullet 2
using T = std::reference_wrapper<Tag>;
using DT = std::reference_wrapper<DerFromTag>;
using CT = std::reference_wrapper<const Tag>;
static_assert(std::is_invocable<Fn, T&, int>::value, "");
static_assert(std::is_invocable<Fn, DT&, int>::value, "");
static_assert(std::is_invocable<Fn, const T&, int>::value, "");
static_assert(std::is_invocable<Fn, T&&, int>::value, "");
static_assert(!std::is_invocable<Fn, CT&, int>::value, "");
static_assert(!std::is_invocable<RFn, T, int>::value, "");
}
{
// Bullet 3
using T = Tag*;
using DT = DerFromTag*;
using CT = const Tag*;
using ST = std::unique_ptr<Tag>;
static_assert(std::is_invocable<Fn, T&, int>::value, "");
static_assert(std::is_invocable<Fn, DT&, int>::value, "");
static_assert(std::is_invocable<Fn, const T&, int>::value, "");
static_assert(std::is_invocable<Fn, T&&, int>::value, "");
static_assert(std::is_invocable<Fn, ST, int>::value, "");
static_assert(!std::is_invocable<Fn, CT&, int>::value, "");
static_assert(!std::is_invocable<RFn, T, int>::value, "");
}
}
{
// Bullets 4, 5 and 6
using Fn = int(Tag::*);
static_assert(!std::is_invocable<Fn>::value, "");
{
// Bullet 4
static_assert(std::is_invocable<Fn, Tag&>::value, "");
static_assert(std::is_invocable<Fn, DerFromTag&>::value, "");
static_assert(std::is_invocable<Fn, Tag&&>::value, "");
static_assert(std::is_invocable<Fn, Tag const&>::value, "");
}
{
// Bullet 5
using T = std::reference_wrapper<Tag>;
using DT = std::reference_wrapper<DerFromTag>;
using CT = std::reference_wrapper<const Tag>;
static_assert(std::is_invocable<Fn, T&>::value, "");
static_assert(std::is_invocable<Fn, DT&>::value, "");
static_assert(std::is_invocable<Fn, const T&>::value, "");
static_assert(std::is_invocable<Fn, T&&>::value, "");
static_assert(std::is_invocable<Fn, CT&>::value, "");
}
{
// Bullet 6
using T = Tag*;
using DT = DerFromTag*;
using CT = const Tag*;
using ST = std::unique_ptr<Tag>;
static_assert(std::is_invocable<Fn, T&>::value, "");
static_assert(std::is_invocable<Fn, DT&>::value, "");
static_assert(std::is_invocable<Fn, const T&>::value, "");
static_assert(std::is_invocable<Fn, T&&>::value, "");
static_assert(std::is_invocable<Fn, ST>::value, "");
static_assert(std::is_invocable<Fn, CT&>::value, "");
}
}
{ // INVOKE bullet 7
{// Function pointer
using Fp = void(*)(Tag&, int);
static_assert(std::is_invocable<Fp, Tag&, int>::value, "");
static_assert(std::is_invocable<Fp, DerFromTag&, int>::value, "");
static_assert(!std::is_invocable<Fp, const Tag&, int>::value, "");
static_assert(!std::is_invocable<Fp>::value, "");
static_assert(!std::is_invocable<Fp, Tag&>::value, "");
}
{
// Function reference
using Fp = void (&)(Tag&, int);
static_assert(std::is_invocable<Fp, Tag&, int>::value, "");
static_assert(std::is_invocable<Fp, DerFromTag&, int>::value, "");
static_assert(!std::is_invocable<Fp, const Tag&, int>::value, "");
static_assert(!std::is_invocable<Fp>::value, "");
static_assert(!std::is_invocable<Fp, Tag&>::value, "");
}
{
// Function object
using Fn = NotCallableWithInt;
static_assert(std::is_invocable<Fn, Tag>::value, "");
static_assert(!std::is_invocable<Fn, int>::value, "");
}
}
{
// Check that the conversion to the return type is properly checked
using Fn = int (*)();
static_assert(std::is_invocable_r<Implicit, Fn>::value, "");
static_assert(std::is_invocable_r<double, Fn>::value, "");
static_assert(std::is_invocable_r<const volatile void, Fn>::value, "");
static_assert(!std::is_invocable_r<Explicit, Fn>::value, "");
}
{
// Check for is_invocable_v
using Fn = void (*)();
static_assert(std::is_invocable_v<Fn>, "");
static_assert(!std::is_invocable_v<Fn, int>, "");
}
{
// Check for is_invocable_r_v
using Fn = void (*)();
static_assert(std::is_invocable_r_v<void, Fn>, "");
static_assert(!std::is_invocable_r_v<int, Fn>, "");
}
return 0;
}
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