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Implement n4169 - Add invoke function template 

llvm-svn: 242195
This commit is contained in:
Eric Fiselier 2015-07-14 20:16:15 +00:00
parent 923860d8ca
commit 5be45129a4
3 changed files with 278 additions and 1 deletions
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9
libcxx/include/functional
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@ -2447,6 +2447,15 @@ struct _LIBCPP_TYPE_VIS_ONLY hash
};
#endif
#if _LIBCPP_STD_VER > 14
template <class _Fn, class ..._Args>
result_of_t<_Fn&&(_Args&&...)>
invoke(_Fn&& __f, _Args&&... __args) {
return __invoke(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)...);
}
#endif
// struct hash<T*> in <memory>
_LIBCPP_END_NAMESPACE_STD

268
libcxx/test/std/utilities/function.objects/func.invoke/invoke.pass.cpp Normal file
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@ -0,0 +1,268 @@
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <functional>
// template <class F, class ...Args>
// result_of_t<F&&(Args&&...)> invoke(F&&, Args&&...);
/// C++14 [func.def] 20.9.0
/// (1) The following definitions apply to this Clause:
/// (2) A call signature is the name of a return type followed by a parenthesized
/// comma-separated list of zero or more argument types.
/// (3) A callable type is a function object type (20.9) or a pointer to member.
/// (4) A callable object is an object of a callable type.
/// (5) A call wrapper type is a type that holds a callable object and supports
/// a call operation that forwards to that object.
/// (6) A call wrapper is an object of a call wrapper type.
/// (7) A target object is the callable object held by a call wrapper.
/// C++14 [func.require] 20.9.1
///
/// Define INVOKE (f, t1, t2, ..., tN) as follows:
/// (1.1) — (t1.*f)(t2, ..., tN) when f is a pointer to a member function of a class T and t1 is an object of
/// type T or a reference to an object of type T or a reference to an object of a type derived from T;
/// (1.2) — ((*t1).*f)(t2, ..., tN) when f is a pointer to a member function of a class T and t1 is not one of
/// the types described in the previous item;
/// (1.3) — t1.*f when N == 1 and f is a pointer to member data of a class T and t1 is an object of type T or a
/// reference to an object of type T or a reference to an object of a type derived from T;
/// (1.4) — (*t1).*f when N == 1 and f is a pointer to member data of a class T and t1 is not one of the types
/// described in the previous item;
/// (1.5) — f(t1, t2, ..., tN) in all other cases.
#include <functional>
#include <type_traits>
#include <cassert>
struct NonCopyable {
NonCopyable() {}
private:
NonCopyable(NonCopyable const&) = delete;
NonCopyable& operator=(NonCopyable const&) = delete;
};
struct TestClass {
explicit TestClass(int x) : data(x) {}
int& operator()(NonCopyable&&) & { return data; }
int const& operator()(NonCopyable&&) const & { return data; }
int volatile& operator()(NonCopyable&&) volatile & { return data; }
int const volatile& operator()(NonCopyable&&) const volatile & { return data; }
int&& operator()(NonCopyable&&) && { return std::move(data); }
int const&& operator()(NonCopyable&&) const && { return std::move(data); }
int volatile&& operator()(NonCopyable&&) volatile && { return std::move(data); }
int const volatile&& operator()(NonCopyable&&) const volatile && { return std::move(data); }
int data;
private:
TestClass(TestClass const&) = delete;
TestClass& operator=(TestClass const&) = delete;
};
struct DerivedFromTestClass : public TestClass {
explicit DerivedFromTestClass(int x) : TestClass(x) {}
};
int& foo(NonCopyable&&) {
static int data = 42;
return data;
}
template <class Signature, class Expect, class Functor>
void test_b12(Functor&& f) {
// Create the callable object.
typedef Signature TestClass::*ClassFunc;
ClassFunc func_ptr = &TestClass::operator();
// Create the dummy arg.
NonCopyable arg;
// Check that the deduced return type of invoke is what is expected.
typedef decltype(
std::invoke(func_ptr, std::forward<Functor>(f), std::move(arg))
) DeducedReturnType;
static_assert((std::is_same<DeducedReturnType, Expect>::value), "");
// Check that result_of_t matches Expect.
typedef typename std::result_of<ClassFunc&&(Functor&&, NonCopyable&&)>::type
ResultOfReturnType;
static_assert((std::is_same<ResultOfReturnType, Expect>::value), "");
// Run invoke and check the return value.
DeducedReturnType ret =
std::invoke(func_ptr, std::forward<Functor>(f), std::move(arg));
assert(ret == 42);
}
template <class Expect, class Functor>
void test_b34(Functor&& f) {
// Create the callable object.
typedef int TestClass::*ClassFunc;
ClassFunc func_ptr = &TestClass::data;
// Check that the deduced return type of invoke is what is expected.
typedef decltype(
std::invoke(func_ptr, std::forward<Functor>(f))
) DeducedReturnType;
static_assert((std::is_same<DeducedReturnType, Expect>::value), "");
// Check that result_of_t matches Expect.
typedef typename std::result_of<ClassFunc&&(Functor&&)>::type
ResultOfReturnType;
static_assert((std::is_same<ResultOfReturnType, Expect>::value), "");
// Run invoke and check the return value.
DeducedReturnType ret =
std::invoke(func_ptr, std::forward<Functor>(f));
assert(ret == 42);
}
template <class Expect, class Functor>
void test_b5(Functor&& f) {
NonCopyable arg;
// Check that the deduced return type of invoke is what is expected.
typedef decltype(
std::invoke(std::forward<Functor>(f), std::move(arg))
) DeducedReturnType;
static_assert((std::is_same<DeducedReturnType, Expect>::value), "");
// Check that result_of_t matches Expect.
typedef typename std::result_of<Functor&&(NonCopyable&&)>::type
ResultOfReturnType;
static_assert((std::is_same<ResultOfReturnType, Expect>::value), "");
// Run invoke and check the return value.
DeducedReturnType ret = std::invoke(std::forward<Functor>(f), std::move(arg));
assert(ret == 42);
}
void bullet_one_two_tests() {
{
TestClass cl(42);
test_b12<int&(NonCopyable&&) &, int&>(cl);
test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
test_b12<int&&(NonCopyable&&) &&, int&&>(std::move(cl));
test_b12<int const&&(NonCopyable&&) const &&, int const&&>(std::move(cl));
test_b12<int volatile&&(NonCopyable&&) volatile &&, int volatile&&>(std::move(cl));
test_b12<int const volatile&&(NonCopyable&&) const volatile &&, int const volatile&&>(std::move(cl));
}
{
DerivedFromTestClass cl(42);
test_b12<int&(NonCopyable&&) &, int&>(cl);
test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
test_b12<int&&(NonCopyable&&) &&, int&&>(std::move(cl));
test_b12<int const&&(NonCopyable&&) const &&, int const&&>(std::move(cl));
test_b12<int volatile&&(NonCopyable&&) volatile &&, int volatile&&>(std::move(cl));
test_b12<int const volatile&&(NonCopyable&&) const volatile &&, int const volatile&&>(std::move(cl));
}
{
TestClass cl_obj(42);
TestClass *cl = &cl_obj;
test_b12<int&(NonCopyable&&) &, int&>(cl);
test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
}
{
DerivedFromTestClass cl_obj(42);
DerivedFromTestClass *cl = &cl_obj;
test_b12<int&(NonCopyable&&) &, int&>(cl);
test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
}
}
void bullet_three_four_tests() {
{
typedef TestClass Fn;
Fn cl(42);
test_b34<int&>(cl);
test_b34<int const&>(static_cast<Fn const&>(cl));
test_b34<int volatile&>(static_cast<Fn volatile&>(cl));
test_b34<int const volatile&>(static_cast<Fn const volatile &>(cl));
test_b34<int&&>(static_cast<Fn &&>(cl));
test_b34<int const&&>(static_cast<Fn const&&>(cl));
test_b34<int volatile&&>(static_cast<Fn volatile&&>(cl));
test_b34<int const volatile&&>(static_cast<Fn const volatile&&>(cl));
}
{
typedef DerivedFromTestClass Fn;
Fn cl(42);
test_b34<int&>(cl);
test_b34<int const&>(static_cast<Fn const&>(cl));
test_b34<int volatile&>(static_cast<Fn volatile&>(cl));
test_b34<int const volatile&>(static_cast<Fn const volatile &>(cl));
test_b34<int&&>(static_cast<Fn &&>(cl));
test_b34<int const&&>(static_cast<Fn const&&>(cl));
test_b34<int volatile&&>(static_cast<Fn volatile&&>(cl));
test_b34<int const volatile&&>(static_cast<Fn const volatile&&>(cl));
}
{
typedef TestClass Fn;
Fn cl_obj(42);
Fn* cl = &cl_obj;
test_b34<int&>(cl);
test_b34<int const&>(static_cast<Fn const*>(cl));
test_b34<int volatile&>(static_cast<Fn volatile*>(cl));
test_b34<int const volatile&>(static_cast<Fn const volatile *>(cl));
}
{
typedef DerivedFromTestClass Fn;
Fn cl_obj(42);
Fn* cl = &cl_obj;
test_b34<int&>(cl);
test_b34<int const&>(static_cast<Fn const*>(cl));
test_b34<int volatile&>(static_cast<Fn volatile*>(cl));
test_b34<int const volatile&>(static_cast<Fn const volatile *>(cl));
}
}
void bullet_five_tests() {
using FooType = int&(NonCopyable&&);
{
FooType& fn = foo;
test_b5<int &>(fn);
}
{
FooType* fn = foo;
test_b5<int &>(fn);
}
{
typedef TestClass Fn;
Fn cl(42);
test_b5<int&>(cl);
test_b5<int const&>(static_cast<Fn const&>(cl));
test_b5<int volatile&>(static_cast<Fn volatile&>(cl));
test_b5<int const volatile&>(static_cast<Fn const volatile &>(cl));
test_b5<int&&>(static_cast<Fn &&>(cl));
test_b5<int const&&>(static_cast<Fn const&&>(cl));
test_b5<int volatile&&>(static_cast<Fn volatile&&>(cl));
test_b5<int const volatile&&>(static_cast<Fn const volatile&&>(cl));
}
}
int main() {
bullet_one_two_tests();
bullet_three_four_tests();
bullet_five_tests();
}

2
libcxx/www/cxx1z_status.html
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@ -54,7 +54,7 @@
-->
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3911">N3911</a></td><td>LWG</td></td><td>TransformationTrait Alias <code>void_t</code>.</td><td>Urbana</td><td>Complete</td><td>3.6</td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4089">N4089</a></td><td>LWG</td></td><td>Safe conversions in <code>unique_ptr&lt;T[]&gt;</code>.</td><td>Urbana</td><td></td><td></td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4169">N4169</a></td><td>LWG</td></td><td>A proposal to add invoke function template</td><td>Urbana</td><td></td><td></td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4169">N4169</a></td><td>LWG</td></td><td>A proposal to add invoke function template</td><td>Urbana</td><td>Complete</td><td>3.7</td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4190">N4190</a></td></td><td>LWG</td><td>Removing auto_ptr, random_shuffle(), And Old <functional> Stuff.</td><td>Urbana</td><td></td><td></td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4258">N4258</a></td><td>LWG</td></td><td>Cleaning-up noexcept in the Library.</td><td>Urbana</td><td>In progress</td><td>3.7</td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4259">N4259</a></td><td>CWG</td></td><td>Wording for std::uncaught_exceptions</td><td>Urbana</td><td>Complete</td><td>3.7</td></tr>