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// { dg-options "-std=gnu++17" }
// { dg-do run }
// Copyright (C) 2014-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include <any>
#include <string>
#include <utility>
#include <cstring>
#include <testsuite_hooks.h>
using std::any;
using std::any_cast;
void test01()
{
using std::string;
using std::strcmp;
// taken from example in N3804 proposal
any x(5); // x holds int
VERIFY(any_cast<int>(x) == 5); // cast to value
any_cast<int&>(x) = 10; // cast to reference
VERIFY(any_cast<int>(x) == 10);
x = "Meow"; // x holds const char*
VERIFY(strcmp(any_cast<const char*>(x), "Meow") == 0);
any_cast<const char*&>(x) = "Harry";
VERIFY(strcmp(any_cast<const char*>(x), "Harry") == 0);
x = string("Meow"); // x holds string
string s, s2("Jane");
s = move(any_cast<string&>(x)); // move from any
VERIFY(s == "Meow");
any_cast<string&>(x) = move(s2); // move to any
VERIFY(any_cast<const string&>(x) == "Jane");
string cat("Meow");
const any y(cat); // const y holds string
VERIFY(any_cast<const string&>(y) == cat);
}
void test02()
{
using std::bad_any_cast;
any x(1);
auto p = any_cast<double>(&x);
VERIFY(p == nullptr);
x = 1.0;
p = any_cast<double>(&x);
VERIFY(p != nullptr);
x = any();
p = any_cast<double>(&x);
VERIFY(p == nullptr);
try {
any_cast<double>(x);
VERIFY(false);
} catch (const bad_any_cast&) {
}
}
static int move_count = 0;
void test03()
{
struct MoveEnabled
{
MoveEnabled(MoveEnabled&&)
{
++move_count;
}
MoveEnabled() = default;
MoveEnabled(const MoveEnabled&) = default;
};
MoveEnabled m;
MoveEnabled m2 = any_cast<MoveEnabled>(any(m));
VERIFY(move_count == 1);
MoveEnabled&& m3 = any_cast<MoveEnabled&&>(any(m));
VERIFY(move_count == 1);
}
void test04()
{
struct ExplicitCopy
{
ExplicitCopy() = default;
explicit ExplicitCopy(const ExplicitCopy&) = default;
};
any x = ExplicitCopy();
ExplicitCopy ec{any_cast<ExplicitCopy>(x)};
ExplicitCopy ec2{any_cast<ExplicitCopy>(std::move(x))};
}
void test05()
{
// PR libstdc++/69321
struct noncopyable {
noncopyable(noncopyable const&) = delete;
};
any a;
auto p = any_cast<noncopyable>(&a);
VERIFY( p == nullptr );
}
void test06()
{
// The contained value of a std::any is always an object type,
// but std::any_cast does not forbid checking for function types.
any a(1);
void (*p1)() = any_cast<void()>(&a);
VERIFY( p1 == nullptr );
int (*p2)(int) = any_cast<int(int)>(&a);
VERIFY( p2 == nullptr );
int (*p3)() = any_cast<int()>(&std::as_const(a));
VERIFY( p3 == nullptr );
try {
any_cast<int(&)()>(a);
VERIFY( false );
} catch (const std::bad_any_cast&) {
}
try {
any_cast<int(&)()>(std::move(a));
VERIFY( false );
} catch (const std::bad_any_cast&) {
}
try {
any_cast<int(&)()>(std::as_const(a));
VERIFY( false );
} catch (const std::bad_any_cast&) {
}
}
void test07()
{
int arr[3];
any a(arr);
VERIFY( a.type() == typeid(int*) ); // contained value is decayed
int (*p1)[3] = any_cast<int[3]>(&a);
VERIFY( a.type() != typeid(int[3]) ); // so any_cast should return nullptr
VERIFY( p1 == nullptr );
int (*p2)[] = any_cast<int[]>(&a);
VERIFY( a.type() != typeid(int[]) ); // so any_cast should return nullptr
VERIFY( p2 == nullptr );
const int (*p3)[] = any_cast<int[]>(&std::as_const(a));
VERIFY( p3 == nullptr );
}
int main()
{
test01();
test02();
test03();
test04();
test05();
test06();
test07();
}
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