/usr/include/osgEarth/optional is in libosgearth-dev 2.7.0+dfsg-2+b3.
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/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2015 Pelican Mapping
* http://osgearth.org
*
* osgEarth is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
#ifndef OSGEARTH_OPTIONAL_H
#define OSGEARTH_OPTIONAL_H 1
namespace osgEarth
{
/**
* A template for defining "optional" class members. An optional member has a default value
* and a flag indicating whether the member is "set".
* This is used extensively in osgEarth's ConfigOptions subsystem.
*/
template<typename T> struct optional {
optional() : _set(false), _value(T()), _defaultValue(T()) { }
optional(T defaultValue) : _set(false), _value(defaultValue), _defaultValue(defaultValue) { }
optional(T defaultValue, T value) : _set(true), _value(value), _defaultValue(defaultValue) { }
optional(const optional<T>& rhs) { (*this)=rhs; }
virtual ~optional() { }
optional<T>& operator =(const optional<T>& rhs) { _set=rhs._set; _value=rhs._value; _defaultValue=rhs._defaultValue; return *this; }
const T& operator =(const T& value) { _set=true; _value=value; return _value; }
bool operator ==(const optional<T>& rhs) const { return _set && rhs._set && _value==rhs._value; }
bool operator !=(const optional<T>& rhs) const { return !( (*this)==rhs); }
bool operator ==(const T& value) const { return _value==value; }
bool operator !=(const T& value) const { return _value!=value; }
bool operator > (const T& value) const { return _value>value; }
bool operator >=(const T& value) const { return _value>=value; }
bool operator < (const T& value) const { return _value<value; }
bool operator <=(const T& value) const { return _value<=value; }
bool isSetTo(const T& value) const { return _set && _value==value; } // differs from == in that the value must be explicity set
bool isSet() const { return _set; }
void unset() { _set = false; _value=_defaultValue; }
const T& get() const { return _value; }
const T& value() const { return _value; }
const T& defaultValue() const { return _defaultValue; }
T temp_copy() const { return _value; }
const T& getOrUse(const T& fallback) const { return _set ? _value : fallback; }
// gets a mutable reference, automatically setting
T& mutable_value() { _set = true; return _value; }
void init(T defValue) { _value=defValue; _defaultValue=defValue; unset(); }
operator const T*() const { return &_value; }
T* operator ->() { _set=true; return &_value; }
const T* operator ->() const { return &_value; }
private:
bool _set;
T _value;
T _defaultValue;
typedef T* optional::*unspecified_bool_type;
public:
operator unspecified_bool_type() const { return 0; }
};
}
#endif // OSGEARTH_OPTIONAL_H
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