forked from OSchip/llvm-project
350 lines
13 KiB
C++
350 lines
13 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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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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