Source
//# Opt.h: simple C++11 alternative to C++17 std::optional
//# Copyright (C) 2019
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
//#
namespace casatools {
template <typename T> class OptionValue {
public:
const T &get( ) {
if ( ! has_value_ )
throw std::runtime_error("attempt to retrieve value from none (option)");
return value_;
}
bool has_value( ) { return has_value_; }
private:
template<typename U> friend class opt;
OptionValue( ) : has_value_(false) { }
OptionValue( const T &val ): has_value_(true), value_(val) { }
bool has_value_;
T value_;
};
template <typename T> class opt {
public:
static OptionValue<T> some(const T& val) { return OptionValue<T>(val); }
static OptionValue<T> none( ) { return OptionValue<T>( ); }
};
}