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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
//
//===----------------------------------------------------------------------===//
// <functional>
// class function<R(ArgTypes...)>
// function(Fp);
// Ensure that __not_null works for all function types.
// See https://bugs.llvm.org/show_bug.cgi?id=23589
//------------------------------------------------------------------------------
// TESTING std::function<...>::__not_null(Callable)
//
// Concerns:
// 1) The call __not_null(Callable) is well formed and correct for each
// possible 'Callable' type category. These categories include:
// 1a) function pointers
// 1b) member function pointer
// 1c) member data pointer
// 1d) callable class type
// 1e) lambdas
// Categories 1a, 1b, and 1c are 'Nullable' types. Only objects of these
// types can be null. The other categories are not tested here.
// 3) '__not_null(Callable)' is well formed when the call signature includes
// varargs.
// 4) '__not_null(Callable)' works for Callable types with all arities less
// than or equal to 3 in C++03.
// 5) '__not_null(Callable)' works when 'Callable' is a member function
// pointer to a cv or ref qualified function type.
//
// Plan:
// 1 For categories 1a, 1b and 1c define a set of
// 'Callable' objects for this category. This set should include examples
// of arity 0, 1, 2 and possible 3 including versions with varargs as the
// last parameter.
//
// 2 For each 'Callable' object in categories 1a, 1b and 1c do the following.
//
// 1 Define a type 'std::function<Sig>' as 'F' where 'Sig' is compatible with
// the signature of the 'Callable' object.
//
// 2 Create an object of type 'F' using a null pointer of type 'Callable'.
// Check that 'F.target<Callable>()' is null.
//
// 3 Create an object of type 'F' that is not null. Check that
// 'F.target<Callable>()' is not null and is equal to the original
// argument.
#include <functional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
///////////////////////////////////////////////////////////////////////////////
int foo() { return 42; }
int foo(int) { return 42; }
int foo(int, int) { return 42; }
int foo(int, int, int) { return 42; }
int foo(...) { return 42; }
int foo(int, ...) { return 42; }
int foo(int, int, ...) { return 42; }
int foo(int, int, int, ...) { return 42; }
///////////////////////////////////////////////////////////////////////////////
struct MemFun03 {
int foo() { return 42; }
int foo() const { return 42; }
int foo() volatile { return 42; }
int foo() const volatile { return 42; }
int foo(int) { return 42; }
int foo(int) const { return 42; }
int foo(int) volatile { return 42; }
int foo(int) const volatile { return 42; }
int foo(int, int) { return 42; }
int foo(int, int) const { return 42; }
int foo(int, int) volatile { return 42; }
int foo(int, int) const volatile { return 42; }
int foo(int, int, int) { return 42; }
int foo(int, int, int) const { return 42; }
int foo(int, int, int) volatile { return 42; }
int foo(int, int, int) const volatile { return 42; }
int foo(...) { return 42; }
int foo(...) const { return 42; }
int foo(...) volatile { return 42; }
int foo(...) const volatile { return 42; }
int foo(int, ...) { return 42; }
int foo(int, ...) const { return 42; }
int foo(int, ...) volatile { return 42; }
int foo(int, ...) const volatile { return 42; }
int foo(int, int, ...) { return 42; }
int foo(int, int, ...) const { return 42; }
int foo(int, int, ...) volatile { return 42; }
int foo(int, int, ...) const volatile { return 42; }
int foo(int, int, int, ...) { return 42; }
int foo(int, int, int, ...) const { return 42; }
int foo(int, int, int, ...) volatile { return 42; }
int foo(int, int, int, ...) const volatile { return 42; }
};
#if TEST_STD_VER >= 11
struct MemFun11 {
int foo() & { return 42; }
int foo() const & { return 42; }
int foo() volatile & { return 42; }
int foo() const volatile & { return 42; }
int foo(...) & { return 42; }
int foo(...) const & { return 42; }
int foo(...) volatile & { return 42; }
int foo(...) const volatile & { return 42; }
int foo() && { return 42; }
int foo() const && { return 42; }
int foo() volatile && { return 42; }
int foo() const volatile && { return 42; }
int foo(...) && { return 42; }
int foo(...) const && { return 42; }
int foo(...) volatile && { return 42; }
int foo(...) const volatile && { return 42; }
};
#endif // TEST_STD_VER >= 11
struct MemData {
int foo;
};
// Create a non-null free function by taking the address of
// &static_cast<Tp&>(foo);
template <class Tp>
struct Creator {
static Tp create() {
return &foo;
}
};
// Create a non-null member pointer.
template <class Ret, class Class>
struct Creator<Ret Class::*> {
typedef Ret Class::*ReturnType;
static ReturnType create() {
return &Class::foo;
}
};
template <class TestFn, class Fn>
void test_imp() {
{ // Check that the null value is detected
TestFn tf = nullptr;
std::function<Fn> f = tf;
assert(f.template target<TestFn>() == nullptr);
}
{ // Check that the non-null value is detected.
TestFn tf = Creator<TestFn>::create();
assert(tf != nullptr);
std::function<Fn> f = tf;
assert(f.template target<TestFn>() != nullptr);
assert(*f.template target<TestFn>() == tf);
}
}
void test_func() {
test_imp<int(*)(), int()>();
test_imp<int(*)(...), int()>();
test_imp<int(*)(int), int(int)>();
test_imp<int(*)(int, ...), int(int)>();
test_imp<int(*)(int, int), int(int, int)>();
test_imp<int(*)(int, int, ...), int(int, int)>();
test_imp<int(*)(int, int, int), int(int, int, int)>();
test_imp<int(*)(int, int, int, ...), int(int, int, int)>();
}
void test_mf() {
test_imp<int(MemFun03::*)(), int(MemFun03&)>();
test_imp<int(MemFun03::*)(...), int(MemFun03&)>();
test_imp<int(MemFun03::*)() const, int(MemFun03&)>();
test_imp<int(MemFun03::*)(...) const, int(MemFun03&)>();
test_imp<int(MemFun03::*)() volatile, int(MemFun03&)>();
test_imp<int(MemFun03::*)(...) volatile, int(MemFun03&)>();
test_imp<int(MemFun03::*)() const volatile, int(MemFun03&)>();
test_imp<int(MemFun03::*)(...) const volatile, int(MemFun03&)>();
test_imp<int(MemFun03::*)(int), int(MemFun03&, int)>();
test_imp<int(MemFun03::*)(int, ...), int(MemFun03&, int)>();
test_imp<int(MemFun03::*)(int) const, int(MemFun03&, int)>();
test_imp<int(MemFun03::*)(int, ...) const, int(MemFun03&, int)>();
test_imp<int(MemFun03::*)(int) volatile, int(MemFun03&, int)>();
test_imp<int(MemFun03::*)(int, ...) volatile, int(MemFun03&, int)>();
test_imp<int(MemFun03::*)(int) const volatile, int(MemFun03&, int)>();
test_imp<int(MemFun03::*)(int, ...) const volatile, int(MemFun03&, int)>();
test_imp<int(MemFun03::*)(int, int), int(MemFun03&, int, int)>();
test_imp<int(MemFun03::*)(int, int, ...), int(MemFun03&, int, int)>();
test_imp<int(MemFun03::*)(int, int) const, int(MemFun03&, int, int)>();
test_imp<int(MemFun03::*)(int, int, ...) const, int(MemFun03&, int, int)>();
test_imp<int(MemFun03::*)(int, int) volatile, int(MemFun03&, int, int)>();
test_imp<int(MemFun03::*)(int, int, ...) volatile, int(MemFun03&, int, int)>();
test_imp<int(MemFun03::*)(int, int) const volatile, int(MemFun03&, int, int)>();
test_imp<int(MemFun03::*)(int, int, ...) const volatile, int(MemFun03&, int, int)>();
#if TEST_STD_VER >= 11
test_imp<int(MemFun11::*)() &, int(MemFun11&)>();
test_imp<int(MemFun11::*)(...) &, int(MemFun11&)>();
test_imp<int(MemFun11::*)() const &, int(MemFun11&)>();
test_imp<int(MemFun11::*)(...) const &, int(MemFun11&)>();
test_imp<int(MemFun11::*)() volatile &, int(MemFun11&)>();
test_imp<int(MemFun11::*)(...) volatile &, int(MemFun11&)>();
test_imp<int(MemFun11::*)() const volatile &, int(MemFun11&)>();
test_imp<int(MemFun11::*)(...) const volatile &, int(MemFun11&)>();
test_imp<int(MemFun11::*)() &&, int(MemFun11&&)>();
test_imp<int(MemFun11::*)(...) &&, int(MemFun11&&)>();
test_imp<int(MemFun11::*)() const &&, int(MemFun11&&)>();
test_imp<int(MemFun11::*)(...) const &&, int(MemFun11&&)>();
test_imp<int(MemFun11::*)() volatile &&, int(MemFun11&&)>();
test_imp<int(MemFun11::*)(...) volatile &&, int(MemFun11&&)>();
test_imp<int(MemFun11::*)() const volatile &&, int(MemFun11&&)>();
test_imp<int(MemFun11::*)(...) const volatile &&, int(MemFun11&&)>();
#endif
}
void test_md() {
test_imp<int MemData::*, int(MemData&)>();
}
int main(int, char**) {
test_func();
test_mf();
test_md();
return 0;
}
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