/usr/include/apertium-3.4/apertium/optional.h is in apertium-dev 3.4.2~r68466-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// This program 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 2 of the
// License, or (at your option) any later version.
//
// This program 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 program; if not, see <http://www.gnu.org/licenses/>.
#ifndef OPTIONAL_H
#define OPTIONAL_H
#include "exception.h"
#include <algorithm>
#include <cstddef>
#include <exception>
#include <new>
namespace Apertium {
template <typename OptionalType> class Optional;
template <typename OptionalType>
void swap(Optional<OptionalType> &A, Optional<OptionalType> &B);
template <typename OptionalType> class Optional {
public:
friend void swap<OptionalType>(Optional &A, Optional &B);
Optional();
Optional(const OptionalType &OptionalType_);
Optional(const Optional &Optional_);
Optional &operator=(Optional Optional_);
~Optional();
const OptionalType &operator*() const;
OptionalType &operator*();
const OptionalType *operator->() const;
OptionalType *operator->();
operator bool() const;
private:
OptionalType *TheOptionalTypePointer;
};
template <typename OptionalType>
void swap(Optional<OptionalType> &A, Optional<OptionalType> &B) {
using std::swap;
swap(A.TheOptionalTypePointer, B.TheOptionalTypePointer);
}
template <typename OptionalType>
Optional<OptionalType>::Optional()
: TheOptionalTypePointer(NULL) {}
template <typename OptionalType>
Optional<OptionalType>::Optional(const OptionalType &OptionalType_)
: TheOptionalTypePointer(new OptionalType(OptionalType_)) {}
template <typename OptionalType>
Optional<OptionalType>::Optional(const Optional &Optional_) {
if (Optional_.TheOptionalTypePointer == NULL) {
TheOptionalTypePointer = NULL;
return;
}
TheOptionalTypePointer =
new OptionalType(*(Optional_.TheOptionalTypePointer));
}
template <typename OptionalType>
Optional<OptionalType> &Optional<OptionalType>::operator=(Optional Optional_) {
swap(*this, Optional_);
return *this;
}
template <typename OptionalType> Optional<OptionalType>::~Optional() {
if (TheOptionalTypePointer == NULL)
return;
delete TheOptionalTypePointer;
}
template <typename OptionalType>
const OptionalType &Optional<OptionalType>::operator*() const {
if (TheOptionalTypePointer == NULL)
throw Exception::Optional::TheOptionalTypePointer_null(
"can't dereference Optional comprising null OptionalType pointer");
return *TheOptionalTypePointer;
}
template <typename OptionalType>
OptionalType &Optional<OptionalType>::operator*() {
return const_cast<OptionalType &>(
static_cast<const Optional &>(*this).operator*());
}
template <typename OptionalType>
const OptionalType *Optional<OptionalType>::operator->() const {
if (TheOptionalTypePointer == NULL)
throw Exception::Optional::TheOptionalTypePointer_null(
"can't dereference Optional comprising null OptionalType pointer");
return TheOptionalTypePointer;
}
template <typename OptionalType>
OptionalType *Optional<OptionalType>::operator->() {
return const_cast<OptionalType *>(
static_cast<const Optional &>(*this).operator->());
}
template <typename OptionalType> Optional<OptionalType>::operator bool() const {
return TheOptionalTypePointer != NULL;
}
}
#endif
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