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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++03, c++11, c++14
// Throwing bad_any_cast is supported starting in macosx10.13
// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
// <any>
// template <class ValueType>
// ValueType const* any_cast(any const *) noexcept;
//
// template <class ValueType>
// ValueType * any_cast(any *) noexcept;
#include <any>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "any_helpers.h"
using std::any;
using std::any_cast;
// Test that the operators are properly noexcept.
void test_cast_is_noexcept() {
any a;
ASSERT_NOEXCEPT(any_cast<int>(&a));
any const& ca = a;
ASSERT_NOEXCEPT(any_cast<int>(&ca));
}
// Test that the return type of any_cast is correct.
void test_cast_return_type() {
any a;
ASSERT_SAME_TYPE(decltype(any_cast<int>(&a)), int*);
ASSERT_SAME_TYPE(decltype(any_cast<int const>(&a)), int const*);
any const& ca = a;
ASSERT_SAME_TYPE(decltype(any_cast<int>(&ca)), int const*);
ASSERT_SAME_TYPE(decltype(any_cast<int const>(&ca)), int const*);
}
// Test that any_cast handles null pointers.
void test_cast_nullptr() {
any* a = nullptr;
assert(nullptr == any_cast<int>(a));
assert(nullptr == any_cast<int const>(a));
any const* ca = nullptr;
assert(nullptr == any_cast<int>(ca));
assert(nullptr == any_cast<int const>(ca));
}
// Test casting an empty object.
void test_cast_empty() {
{
any a;
assert(nullptr == any_cast<int>(&a));
assert(nullptr == any_cast<int const>(&a));
any const& ca = a;
assert(nullptr == any_cast<int>(&ca));
assert(nullptr == any_cast<int const>(&ca));
}
// Create as non-empty, then make empty and run test.
{
any a(42);
a.reset();
assert(nullptr == any_cast<int>(&a));
assert(nullptr == any_cast<int const>(&a));
any const& ca = a;
assert(nullptr == any_cast<int>(&ca));
assert(nullptr == any_cast<int const>(&ca));
}
}
template <class Type>
void test_cast() {
assert(Type::count == 0);
Type::reset();
{
any a((Type(42)));
any const& ca = a;
assert(Type::count == 1);
assert(Type::copied == 0);
assert(Type::moved == 1);
// Try a cast to a bad type.
// NOTE: Type cannot be an int.
assert(any_cast<int>(&a) == nullptr);
assert(any_cast<int const>(&a) == nullptr);
assert(any_cast<int const volatile>(&a) == nullptr);
// Try a cast to the right type, but as a pointer.
assert(any_cast<Type*>(&a) == nullptr);
assert(any_cast<Type const*>(&a) == nullptr);
// Check getting a unqualified type from a non-const any.
Type* v = any_cast<Type>(&a);
assert(v != nullptr);
assert(v->value == 42);
// change the stored value and later check for the new value.
v->value = 999;
// Check getting a const qualified type from a non-const any.
Type const* cv = any_cast<Type const>(&a);
assert(cv != nullptr);
assert(cv == v);
assert(cv->value == 999);
// Check getting a unqualified type from a const any.
cv = any_cast<Type>(&ca);
assert(cv != nullptr);
assert(cv == v);
assert(cv->value == 999);
// Check getting a const-qualified type from a const any.
cv = any_cast<Type const>(&ca);
assert(cv != nullptr);
assert(cv == v);
assert(cv->value == 999);
// Check that no more objects were created, copied or moved.
assert(Type::count == 1);
assert(Type::copied == 0);
assert(Type::moved == 1);
}
assert(Type::count == 0);
}
void test_cast_non_copyable_type()
{
// Even though 'any' never stores non-copyable types
// we still need to support any_cast<NoCopy>(ptr)
struct NoCopy { NoCopy(NoCopy const&) = delete; };
std::any a(42);
std::any const& ca = a;
assert(std::any_cast<NoCopy>(&a) == nullptr);
assert(std::any_cast<NoCopy>(&ca) == nullptr);
}
void test_cast_array() {
int arr[3];
std::any a(arr);
RTTI_ASSERT(a.type() == typeid(int*)); // contained value is decayed
// We can't get an array out
int (*p)[3] = std::any_cast<int[3]>(&a);
assert(p == nullptr);
}
void test_fn() {}
void test_cast_function_pointer() {
using T = void(*)();
std::any a(test_fn);
// An any can never store a function type, but we should at least be able
// to ask.
assert(std::any_cast<void()>(&a) == nullptr);
T fn_ptr = std::any_cast<T>(a);
assert(fn_ptr == test_fn);
}
int main(int, char**) {
test_cast_is_noexcept();
test_cast_return_type();
test_cast_nullptr();
test_cast_empty();
test_cast<small>();
test_cast<large>();
test_cast_non_copyable_type();
test_cast_array();
test_cast_function_pointer();
return 0;
}
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