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dft_tools/triqs/utility/draft/value_view.hpp
Olivier Parcollet 8c725f8d5e Work on compilation speed.
- h5/make_h5.... only used in parameters.
- old boost includes before C++11
- remove boost serialization, make macro TRIQS_MAKE_NVP temporarely
- remove boost::is_complex (can be written in 2 lines...)
- move some lib in cpp
2014-05-02 20:49:19 +02:00

97 lines
4.3 KiB
C++

/*******************************************************************************
*
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
*
* Copyright (C) 2011 by O. Parcollet
*
* TRIQS 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 3 of the License, or (at your option) any later
* version.
*
* TRIQS 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
* TRIQS. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
#ifndef TRIQS_UTILITY_VALUE_VIEW_H
#define TRIQS_UTILITY_VALUE_VIEW_H
#include <memory>
#include <triqs/arrays/array.hpp>
#include <triqs/arrays/h5.hpp>
namespace triqs {
/// a class to keep a value and the view on it in a manner similar to arrays, gf, etc...
template<typename T, bool IsView > class value_view;
template<typename T> class value_view<T,true> {
std::shared_ptr<T> p;
friend class value_view<T,false>;
public:
typedef value_view<T,true> view_type;
typedef value_view<T,false> regular_type;
typedef typename std::remove_cv<typename std::remove_reference <T>::type >::type value_type;
value_view( regular_type const & a) { p = a.p;}
value_view( view_type const & a) { p = a.p;}
void rebind( view_type const &X) { p = X.p; }
T & operator()() { return *p;}
T const & operator()() const { return *p;}
operator T() { return *p;}
operator T const() const { return *p;}
value_view & operator=(view_type const & x) { if (!p) rebind(x); else { *p = *x.p;} return *this;}
value_view & operator=(regular_type const & x) { if (!p) rebind(x); else { *p = *x.p;} return *this;}
value_view & operator=(T const & x) { *p = x; return *this;}
friend void h5_write (arrays::h5::group_or_file fg, std::string p, value_view const & v) { h5_write(fg,p,v()); }
friend void h5_read (arrays::h5::group_or_file fg, std::string p, value_view & v) { h5_read (fg,p,v()); }
// Boost serialization. Can I use std::shared_ptr directly ? Or use boost::shared_ptr
friend class boost::serialization::access;
template<class Archive>
void save(Archive & ar, const unsigned int version) const { ar << TRIQS_MAKE_NVP("data",*p); }
template<class Archive>
void load(Archive & ar, const unsigned int version) { T x; ar >> x; p = std::make_shared<T>(x); }
BOOST_SERIALIZATION_SPLIT_MEMBER();
};
template<typename T> class value_view<T,false> {
std::shared_ptr<T> p;
friend class value_view<T,true>;
public:
typedef value_view<T,true> view_type;
typedef value_view<T,false> regular_type;
typedef typename std::remove_cv<typename std::remove_reference <T>::type >::type value_type;
value_view( regular_type const & a) { p = std::make_shared<T>(*a.p);}
value_view( view_type const & a) { p = std::make_shared<T>(*a.p);}
template<typename... Args> explicit value_view(Args&&... args) {p = std::make_shared<T>(std::forward<Args>(args)...);}
T & operator()() { return *p;}
T const & operator()() const { return *p;}
operator T() { return *p;}
operator T const() const { return *p;}
value_view& operator=(view_type const & x) { *p = *x.p;return *this;}
value_view& operator=(regular_type const & x) { *p = *x.p;return *this;}
value_view& operator=(T const & x) { *p = x; return *this;}
friend void h5_write (arrays::h5::group_or_file fg, std::string p, value_view const & v) { h5_write(fg,p,v()); }
friend void h5_read (arrays::h5::group_or_file fg, std::string p, value_view & v) { h5_read(fg,p,v()); }
// Boost serialization. Can I use std::shared_ptr directly ? Or use boost::shared_ptr
friend class boost::serialization::access;
template<class Archive>
void save(Archive & ar, const unsigned int version) const { ar << TRIQS_MAKE_NVP("data",*p); }
template<class Archive>
void load(Archive & ar, const unsigned int version) { T x; ar >> x; p = std::make_shared<T>(x); }
BOOST_SERIALIZATION_SPLIT_MEMBER();
};
}//namespace triqs
#endif