57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
349 lines
13 KiB
C++
349 lines
13 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++98, c++03, c++11, c++14
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// <functional>
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// template <class F, class ...Args>
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// result_of_t<F&&(Args&&...)> invoke(F&&, Args&&...);
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/// C++14 [func.def] 20.9.0
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/// (1) The following definitions apply to this Clause:
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/// (2) A call signature is the name of a return type followed by a parenthesized
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/// comma-separated list of zero or more argument types.
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/// (3) A callable type is a function object type (20.9) or a pointer to member.
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/// (4) A callable object is an object of a callable type.
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/// (5) A call wrapper type is a type that holds a callable object and supports
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/// a call operation that forwards to that object.
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/// (6) A call wrapper is an object of a call wrapper type.
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/// (7) A target object is the callable object held by a call wrapper.
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/// C++14 [func.require] 20.9.1
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///
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/// Define INVOKE (f, t1, t2, ..., tN) as follows:
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/// (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
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/// type T or a reference to an object of type T or a reference to an object of a type derived from T;
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/// (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
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/// the types described in the previous item;
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/// (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
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/// reference to an object of type T or a reference to an object of a type derived from T;
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/// (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
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/// described in the previous item;
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/// (1.5) - f(t1, t2, ..., tN) in all other cases.
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#include <functional>
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#include <type_traits>
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#include <utility> // for std::move
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#include <cassert>
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struct NonCopyable {
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NonCopyable() {}
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private:
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NonCopyable(NonCopyable const&) = delete;
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NonCopyable& operator=(NonCopyable const&) = delete;
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};
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struct TestClass {
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explicit TestClass(int x) : data(x) {}
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int& operator()(NonCopyable&&) & { return data; }
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int const& operator()(NonCopyable&&) const & { return data; }
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int volatile& operator()(NonCopyable&&) volatile & { return data; }
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int const volatile& operator()(NonCopyable&&) const volatile & { return data; }
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int&& operator()(NonCopyable&&) && { return std::move(data); }
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int const&& operator()(NonCopyable&&) const && { return std::move(data); }
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int volatile&& operator()(NonCopyable&&) volatile && { return std::move(data); }
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int const volatile&& operator()(NonCopyable&&) const volatile && { return std::move(data); }
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int data;
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private:
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TestClass(TestClass const&) = delete;
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TestClass& operator=(TestClass const&) = delete;
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};
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struct DerivedFromTestClass : public TestClass {
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explicit DerivedFromTestClass(int x) : TestClass(x) {}
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};
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int& foo(NonCopyable&&) {
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static int data = 42;
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return data;
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}
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template <class Signature, class Expect, class Functor>
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void test_b12(Functor&& f) {
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// Create the callable object.
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typedef Signature TestClass::*ClassFunc;
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ClassFunc func_ptr = &TestClass::operator();
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// Create the dummy arg.
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NonCopyable arg;
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// Check that the deduced return type of invoke is what is expected.
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typedef decltype(
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std::invoke(func_ptr, std::forward<Functor>(f), std::move(arg))
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) DeducedReturnType;
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static_assert((std::is_same<DeducedReturnType, Expect>::value), "");
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// Check that result_of_t matches Expect.
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typedef typename std::result_of<ClassFunc&&(Functor&&, NonCopyable&&)>::type
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ResultOfReturnType;
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static_assert((std::is_same<ResultOfReturnType, Expect>::value), "");
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// Run invoke and check the return value.
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DeducedReturnType ret =
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std::invoke(func_ptr, std::forward<Functor>(f), std::move(arg));
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assert(ret == 42);
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}
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template <class Expect, class Functor>
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void test_b34(Functor&& f) {
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// Create the callable object.
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typedef int TestClass::*ClassFunc;
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ClassFunc func_ptr = &TestClass::data;
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// Check that the deduced return type of invoke is what is expected.
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typedef decltype(
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std::invoke(func_ptr, std::forward<Functor>(f))
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) DeducedReturnType;
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static_assert((std::is_same<DeducedReturnType, Expect>::value), "");
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// Check that result_of_t matches Expect.
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typedef typename std::result_of<ClassFunc&&(Functor&&)>::type
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ResultOfReturnType;
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static_assert((std::is_same<ResultOfReturnType, Expect>::value), "");
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// Run invoke and check the return value.
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DeducedReturnType ret =
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std::invoke(func_ptr, std::forward<Functor>(f));
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assert(ret == 42);
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}
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template <class Expect, class Functor>
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void test_b5(Functor&& f) {
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NonCopyable arg;
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// Check that the deduced return type of invoke is what is expected.
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typedef decltype(
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std::invoke(std::forward<Functor>(f), std::move(arg))
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) DeducedReturnType;
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static_assert((std::is_same<DeducedReturnType, Expect>::value), "");
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// Check that result_of_t matches Expect.
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typedef typename std::result_of<Functor&&(NonCopyable&&)>::type
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ResultOfReturnType;
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static_assert((std::is_same<ResultOfReturnType, Expect>::value), "");
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// Run invoke and check the return value.
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DeducedReturnType ret = std::invoke(std::forward<Functor>(f), std::move(arg));
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assert(ret == 42);
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}
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void bullet_one_two_tests() {
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{
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TestClass cl(42);
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test_b12<int&(NonCopyable&&) &, int&>(cl);
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test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
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test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
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test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
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test_b12<int&&(NonCopyable&&) &&, int&&>(std::move(cl));
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test_b12<int const&&(NonCopyable&&) const &&, int const&&>(std::move(cl));
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test_b12<int volatile&&(NonCopyable&&) volatile &&, int volatile&&>(std::move(cl));
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test_b12<int const volatile&&(NonCopyable&&) const volatile &&, int const volatile&&>(std::move(cl));
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}
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{
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DerivedFromTestClass cl(42);
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test_b12<int&(NonCopyable&&) &, int&>(cl);
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test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
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test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
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test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
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test_b12<int&&(NonCopyable&&) &&, int&&>(std::move(cl));
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test_b12<int const&&(NonCopyable&&) const &&, int const&&>(std::move(cl));
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test_b12<int volatile&&(NonCopyable&&) volatile &&, int volatile&&>(std::move(cl));
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test_b12<int const volatile&&(NonCopyable&&) const volatile &&, int const volatile&&>(std::move(cl));
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}
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{
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TestClass cl_obj(42);
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std::reference_wrapper<TestClass> cl(cl_obj);
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test_b12<int&(NonCopyable&&) &, int&>(cl);
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test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
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test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
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test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
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test_b12<int&(NonCopyable&&) &, int&>(std::move(cl));
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test_b12<int const&(NonCopyable&&) const &, int const&>(std::move(cl));
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test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(std::move(cl));
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test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(std::move(cl));
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}
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{
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DerivedFromTestClass cl_obj(42);
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std::reference_wrapper<DerivedFromTestClass> cl(cl_obj);
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test_b12<int&(NonCopyable&&) &, int&>(cl);
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test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
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test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
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test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
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test_b12<int&(NonCopyable&&) &, int&>(std::move(cl));
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test_b12<int const&(NonCopyable&&) const &, int const&>(std::move(cl));
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test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(std::move(cl));
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test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(std::move(cl));
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}
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{
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TestClass cl_obj(42);
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TestClass *cl = &cl_obj;
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test_b12<int&(NonCopyable&&) &, int&>(cl);
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test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
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test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
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test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
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}
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{
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DerivedFromTestClass cl_obj(42);
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DerivedFromTestClass *cl = &cl_obj;
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test_b12<int&(NonCopyable&&) &, int&>(cl);
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test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
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test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
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test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
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}
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}
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void bullet_three_four_tests() {
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{
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typedef TestClass Fn;
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Fn cl(42);
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test_b34<int&>(cl);
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test_b34<int const&>(static_cast<Fn const&>(cl));
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test_b34<int volatile&>(static_cast<Fn volatile&>(cl));
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test_b34<int const volatile&>(static_cast<Fn const volatile &>(cl));
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test_b34<int&&>(static_cast<Fn &&>(cl));
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test_b34<int const&&>(static_cast<Fn const&&>(cl));
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test_b34<int volatile&&>(static_cast<Fn volatile&&>(cl));
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test_b34<int const volatile&&>(static_cast<Fn const volatile&&>(cl));
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}
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{
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typedef DerivedFromTestClass Fn;
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Fn cl(42);
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test_b34<int&>(cl);
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test_b34<int const&>(static_cast<Fn const&>(cl));
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test_b34<int volatile&>(static_cast<Fn volatile&>(cl));
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test_b34<int const volatile&>(static_cast<Fn const volatile &>(cl));
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test_b34<int&&>(static_cast<Fn &&>(cl));
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test_b34<int const&&>(static_cast<Fn const&&>(cl));
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test_b34<int volatile&&>(static_cast<Fn volatile&&>(cl));
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test_b34<int const volatile&&>(static_cast<Fn const volatile&&>(cl));
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}
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{
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typedef TestClass Fn;
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Fn cl(42);
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test_b34<int&>(std::reference_wrapper<Fn>(cl));
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test_b34<int const&>(std::reference_wrapper<Fn const>(cl));
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test_b34<int volatile&>(std::reference_wrapper<Fn volatile>(cl));
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test_b34<int const volatile&>(std::reference_wrapper<Fn const volatile>(cl));
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}
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{
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typedef DerivedFromTestClass Fn;
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Fn cl(42);
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test_b34<int&>(std::reference_wrapper<Fn>(cl));
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test_b34<int const&>(std::reference_wrapper<Fn const>(cl));
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test_b34<int volatile&>(std::reference_wrapper<Fn volatile>(cl));
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test_b34<int const volatile&>(std::reference_wrapper<Fn const volatile>(cl));
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}
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{
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typedef TestClass Fn;
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Fn cl_obj(42);
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Fn* cl = &cl_obj;
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test_b34<int&>(cl);
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test_b34<int const&>(static_cast<Fn const*>(cl));
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test_b34<int volatile&>(static_cast<Fn volatile*>(cl));
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test_b34<int const volatile&>(static_cast<Fn const volatile *>(cl));
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}
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{
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typedef DerivedFromTestClass Fn;
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Fn cl_obj(42);
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Fn* cl = &cl_obj;
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test_b34<int&>(cl);
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test_b34<int const&>(static_cast<Fn const*>(cl));
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test_b34<int volatile&>(static_cast<Fn volatile*>(cl));
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test_b34<int const volatile&>(static_cast<Fn const volatile *>(cl));
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}
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}
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void bullet_five_tests() {
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using FooType = int&(NonCopyable&&);
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{
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FooType& fn = foo;
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test_b5<int &>(fn);
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}
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{
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FooType* fn = foo;
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test_b5<int &>(fn);
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}
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{
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typedef TestClass Fn;
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Fn cl(42);
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test_b5<int&>(cl);
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test_b5<int const&>(static_cast<Fn const&>(cl));
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test_b5<int volatile&>(static_cast<Fn volatile&>(cl));
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test_b5<int const volatile&>(static_cast<Fn const volatile &>(cl));
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test_b5<int&&>(static_cast<Fn &&>(cl));
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test_b5<int const&&>(static_cast<Fn const&&>(cl));
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test_b5<int volatile&&>(static_cast<Fn volatile&&>(cl));
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test_b5<int const volatile&&>(static_cast<Fn const volatile&&>(cl));
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}
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}
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struct CopyThrows {
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CopyThrows() {}
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CopyThrows(CopyThrows const&) {}
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CopyThrows(CopyThrows&&) noexcept {}
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};
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struct NoThrowCallable {
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void operator()() noexcept {}
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void operator()(CopyThrows) noexcept {}
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};
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struct ThrowsCallable {
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void operator()() {}
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};
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struct MemberObj {
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int x;
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};
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void noexcept_test() {
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{
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NoThrowCallable obj; ((void)obj); // suppress unused warning
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CopyThrows arg; ((void)arg); // suppress unused warning
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static_assert(noexcept(std::invoke(obj)), "");
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static_assert(!noexcept(std::invoke(obj, arg)), "");
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static_assert(noexcept(std::invoke(obj, std::move(arg))), "");
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}
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{
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ThrowsCallable obj; ((void)obj); // suppress unused warning
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static_assert(!noexcept(std::invoke(obj)), "");
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}
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{
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MemberObj obj{42}; ((void)obj); // suppress unused warning.
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static_assert(noexcept(std::invoke(&MemberObj::x, obj)), "");
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}
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}
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int main() {
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bullet_one_two_tests();
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bullet_three_four_tests();
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bullet_five_tests();
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noexcept_test();
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}
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