minix/external/bsd/kyua-cli/dist/utils/optional.ipp
Lionel Sambuc 11be35a165 Importing NetBSD "Kyua" test framework
To do so, a few dependencies have been imported:

 * external/bsd/lutok
 * external/mit/lua
 * external/public-domain/sqlite
 * external/public-domain/xz

The Kyua framework is the new generation of ATF (Automated Test
Framework), it is composed of:

 * external/bsd/atf
 * external/bsd/kyua-atf-compat
 * external/bsd/kyua-cli
 * external/bsd/kyua-tester
 * tests

Kyua/ATF being written in C++, it depends on libstdc++ which is
provided by GCC. As this is not part of the sources, Kyua is only
compiled when the native GCC utils are installed.

To install Kyua do the following:

 * In a cross-build enviromnent, add the following to the build.sh
   commandline: -V MKBINUTILS=yes -V MKGCCCMDS=yes

WARNING:
  At this point the import is still experimental, and not supported
  on native builds (a.k.a make build).

Change-Id: I26aee23c5bbd2d64adcb7c1beb98fe0d479d7ada
2013-07-23 20:43:41 +02:00

257 lines
6.4 KiB
C++

// Copyright 2010 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of Google Inc. nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#if !defined(UTILS_OPTIONAL_IPP)
#define UTILS_OPTIONAL_IPP
#include <cstddef>
#include "utils/defs.hpp"
#include "utils/optional.hpp"
#include "utils/sanity.hpp"
/// Initializes an optional object to the none value.
template< class T >
utils::optional< T >::optional(void) :
_data(NULL)
{
}
/// Explicitly initializes an optional object to the none value.
///
/// \param unused_none A copy of the utils::none instance.
template< class T >
utils::optional< T >::optional(
utils::detail::none_t UTILS_UNUSED_PARAM(none)) :
_data(NULL)
{
}
/// Initializes an optional object to a non-none value.
///
/// \param data The initial value for the object.
template< class T >
utils::optional< T >::optional(const T& data) :
_data(new T(data))
{
}
/// Copy constructor.
///
/// \param other The optional object to copy from.
template< class T >
utils::optional< T >::optional(const optional< T >& other) :
_data(other._data == NULL ? NULL : new T(*(other._data)))
{
}
/// Destructor.
template< class T >
utils::optional< T >::~optional(void)
{
if (_data != NULL)
delete _data;
_data = NULL; // Prevent accidental reuse.
}
/// Explicitly assigns an optional object to the none value.
///
/// \param unused_none A copy of the utils::none instance.
///
/// \return A reference to this.
template< class T >
utils::optional< T >&
utils::optional< T >::operator=(utils::detail::none_t UTILS_UNUSED_PARAM(none))
{
if (_data != NULL)
delete _data;
_data = NULL;
return *this;
}
/// Assigns a new value to the optional object.
///
/// \param data The initial value for the object.
///
/// \return A reference to this.
template< class T >
utils::optional< T >&
utils::optional< T >::operator=(const T& data)
{
T* new_data = new T(data);
if (_data != NULL)
delete _data;
_data = new_data;
return *this;
}
/// Copies an optional value.
///
/// \param other The optional object to copy from.
///
/// \return A reference to this.
template< class T >
utils::optional< T >&
utils::optional< T >::operator=(const optional< T >& other)
{
T* new_data = other._data == NULL ? NULL : new T(*(other._data));
if (_data != NULL)
delete _data;
_data = new_data;
return *this;
}
/// Equality comparator.
///
/// \param other The other object to compare this one to.
///
/// \return True if this object and other are equal; false otherwise.
template< class T >
bool
utils::optional< T >::operator==(const optional< T >& other) const
{
if (_data == NULL && other._data == NULL) {
return true;
} else if (_data == NULL || other._data == NULL) {
return false;
} else {
INV(_data != NULL && other._data != NULL);
return *_data == *other._data;
}
}
/// Inequality comparator.
///
/// \param other The other object to compare this one to.
///
/// \return True if this object and other are different; false otherwise.
template< class T >
bool
utils::optional< T >::operator!=(const optional< T >& other) const
{
return !(*this == other);
}
/// Gets the value hold by the optional object.
///
/// \pre The optional object must not be none.
///
/// \return A reference to the data.
template< class T >
const T&
utils::optional< T >::get(void) const
{
PRE(_data != NULL);
return *_data;
}
/// Gets the value of this object with a default fallback.
///
/// \param default_value The value to return if this object holds no value.
///
/// \return A reference to the data in the optional object, or the reference
/// passed in as a parameter.
template< class T >
const T&
utils::optional< T >::get_default(const T& default_value) const
{
if (_data != NULL)
return *_data;
else
return default_value;
}
/// Tests whether the optional object contains data or not.
///
/// \return True if the object is not none; false otherwise.
template< class T >
utils::optional< T >::operator bool(void) const
{
return _data != NULL;
}
/// Tests whether the optional object contains data or not.
///
/// \return True if the object is not none; false otherwise.
template< class T >
T&
utils::optional< T >::get(void)
{
PRE(_data != NULL);
return *_data;
}
/// Injects the object into a stream.
///
/// \param output The stream into which to inject the object.
/// \param object The object to format.
///
/// \return The output stream.
template< class T >
std::ostream& utils::operator<<(std::ostream& output,
const optional< T >& object)
{
if (!object) {
output << "none";
} else {
output << object.get();
}
return output;
}
/// Helper function to instantiate optional objects.
///
/// \param value The value for the optional object. Shouldn't be none, as
/// optional objects can be constructed from none right away.
///
/// \return A new optional object.
template< class T >
utils::optional< T >
utils::make_optional(const T& value)
{
return optional< T >(value);
}
#endif // !defined(UTILS_OPTIONAL_IPP)