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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
//
//===----------------------------------------------------------------------===//
#ifndef EXPERIMENTAL_ANY_HELPERS_H
#define EXPERIMENTAL_ANY_HELPERS_H
#include <experimental/any>
#include <typeinfo>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#if !defined(TEST_HAS_NO_RTTI)
#define RTTI_ASSERT(X) assert(X)
#else
#define RTTI_ASSERT(X)
#endif
template <class T>
struct IsSmallObject
: public std::integral_constant<bool
, sizeof(T) <= (sizeof(void*)*3)
&& std::alignment_of<void*>::value
% std::alignment_of<T>::value == 0
&& std::is_nothrow_move_constructible<T>::value
>
{};
// Return 'true' if 'Type' will be considered a small type by 'any'
template <class Type>
bool isSmallType() {
#if defined(_LIBCPP_VERSION)
return std::experimental::__any_imp::_IsSmallObject<Type>::value;
#else
return IsSmallObject<Type>::value;
#endif
}
// Assert that an object is empty. If the object used to contain an object
// of type 'LastType' check that it can no longer be accessed.
template <class LastType = int>
void assertEmpty(std::experimental::any const& a) {
assert(a.empty());
RTTI_ASSERT(a.type() == typeid(void));
assert(std::experimental::any_cast<LastType const>(&a) == nullptr);
}
// Assert that an 'any' object stores the specified 'Type' and 'value'.
template <class Type>
_LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
void assertContains(std::experimental::any const& a, int value = 1) {
assert(!a.empty());
RTTI_ASSERT(a.type() == typeid(Type));
assert(std::experimental::any_cast<Type const &>(a).value == value);
}
// Modify the value of a "test type" stored within an any to the specified
// 'value'.
template <class Type>
_LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
void modifyValue(std::experimental::any& a, int value) {
assert(!a.empty());
RTTI_ASSERT(a.type() == typeid(Type));
std::experimental::any_cast<Type&>(a).value = value;
}
// A test type that will trigger the small object optimization within 'any'.
template <int Dummy = 0>
struct small_type
{
static int count;
static int copied;
static int moved;
static int const_copied;
static int non_const_copied;
static void reset() {
small_type::copied = 0;
small_type::moved = 0;
small_type::const_copied = 0;
small_type::non_const_copied = 0;
}
int value;
explicit small_type(int val) : value(val) {
++count;
}
small_type(small_type const & other) throw() {
value = other.value;
++count;
++copied;
++const_copied;
}
small_type(small_type& other) throw() {
value = other.value;
++count;
++copied;
++non_const_copied;
}
small_type(small_type && other) throw() {
value = other.value;
other.value = 0;
++count;
++moved;
}
~small_type() {
value = -1;
--count;
}
private:
small_type& operator=(small_type const&) = delete;
small_type& operator=(small_type&&) = delete;
};
template <int Dummy>
int small_type<Dummy>::count = 0;
template <int Dummy>
int small_type<Dummy>::copied = 0;
template <int Dummy>
int small_type<Dummy>::moved = 0;
template <int Dummy>
int small_type<Dummy>::const_copied = 0;
template <int Dummy>
int small_type<Dummy>::non_const_copied = 0;
typedef small_type<> small;
typedef small_type<1> small1;
typedef small_type<2> small2;
// A test type that will NOT trigger the small object optimization in any.
template <int Dummy = 0>
struct large_type
{
static int count;
static int copied;
static int moved;
static int const_copied;
static int non_const_copied;
static void reset() {
large_type::copied = 0;
large_type::moved = 0;
large_type::const_copied = 0;
large_type::non_const_copied = 0;
}
int value;
large_type(int val) : value(val) {
++count;
data[0] = 0;
}
large_type(large_type const & other) {
value = other.value;
++count;
++copied;
++const_copied;
}
large_type(large_type & other) {
value = other.value;
++count;
++copied;
++non_const_copied;
}
large_type(large_type && other) {
value = other.value;
other.value = 0;
++count;
++moved;
}
~large_type() {
value = 0;
--count;
}
private:
large_type& operator=(large_type const&) = delete;
large_type& operator=(large_type &&) = delete;
int data[10];
};
template <int Dummy>
int large_type<Dummy>::count = 0;
template <int Dummy>
int large_type<Dummy>::copied = 0;
template <int Dummy>
int large_type<Dummy>::moved = 0;
template <int Dummy>
int large_type<Dummy>::const_copied = 0;
template <int Dummy>
int large_type<Dummy>::non_const_copied = 0;
typedef large_type<> large;
typedef large_type<1> large1;
typedef large_type<2> large2;
// The exception type thrown by 'small_throws_on_copy', 'large_throws_on_copy'
// and 'throws_on_move'.
struct my_any_exception {};
void throwMyAnyExpression() {
#if !defined(TEST_HAS_NO_EXCEPTIONS)
throw my_any_exception();
#else
assert(false && "Exceptions are disabled");
#endif
}
// A test type that will trigger the small object optimization within 'any'.
// this type throws if it is copied.
struct small_throws_on_copy
{
static int count;
int value;
explicit small_throws_on_copy(int val = 0) : value(val) {
++count;
}
small_throws_on_copy(small_throws_on_copy const &) {
throwMyAnyExpression();
}
small_throws_on_copy(small_throws_on_copy && other) throw() {
value = other.value;
++count;
}
~small_throws_on_copy() {
--count;
}
private:
small_throws_on_copy& operator=(small_throws_on_copy const&) = delete;
small_throws_on_copy& operator=(small_throws_on_copy &&) = delete;
};
int small_throws_on_copy::count = 0;
// A test type that will NOT trigger the small object optimization within 'any'.
// this type throws if it is copied.
struct large_throws_on_copy
{
static int count;
int value = 0;
explicit large_throws_on_copy(int val = 0) : value(val) {
data[0] = 0;
++count;
}
large_throws_on_copy(large_throws_on_copy const &) {
throwMyAnyExpression();
}
large_throws_on_copy(large_throws_on_copy && other) throw() {
value = other.value;
++count;
}
~large_throws_on_copy() {
--count;
}
private:
large_throws_on_copy& operator=(large_throws_on_copy const&) = delete;
large_throws_on_copy& operator=(large_throws_on_copy &&) = delete;
int data[10];
};
int large_throws_on_copy::count = 0;
// A test type that throws when it is moved. This object will NOT trigger
// the small object optimization in 'any'.
struct throws_on_move
{
static int count;
int value;
explicit throws_on_move(int val = 0) : value(val) { ++count; }
throws_on_move(throws_on_move const & other) {
value = other.value;
++count;
}
throws_on_move(throws_on_move &&) {
throwMyAnyExpression();
}
~throws_on_move() {
--count;
}
private:
throws_on_move& operator=(throws_on_move const&) = delete;
throws_on_move& operator=(throws_on_move &&) = delete;
};
int throws_on_move::count = 0;
#endif