ivl/details/core/data/member_control.hpp

/* This file is part of the ivl C++ library <http://image.ntua.gr/ivl>.
   A C++ template library extending syntax towards mathematical notation.

   Copyright (C) 2012 Yannis Avrithis <iavr@image.ntua.gr>
   Copyright (C) 2012 Kimon Kontosis <kimonas@image.ntua.gr>

   ivl is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License 
   version 3 as published by the Free Software Foundation.

   Alternatively, you can redistribute it and/or modify it under the terms 
   of the GNU General Public License version 2 as published by the Free 
   Software Foundation.

   ivl 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 
   and a copy of the GNU Lesser General Public License along 
   with ivl. If not, see <http://www.gnu.org/licenses/>. */

#ifndef IVL_CORE_DETAILS_DATA_MEMBER_CONTROL_HPP
#define IVL_CORE_DETAILS_DATA_MEMBER_CONTROL_HPP

/* This file provides some helper structs that call member functions
for array classes with certain conditions, for example some members
are only defined in arrays with has_random_access = to types::t_true.
The helper functions allow us to call a member only if it exists,
or to do something else in other cases, depending on a certain type. */

namespace ivl {
namespace data {

template<class T>
struct call_if : public call_if<typename T::type> { };

template<>
struct call_if<types::t_true>
{
        template<class C, class A> static inline
        void resize(C c, A a) { c.resize(a); }
};

template<>
struct call_if<types::t_false>
{
        template<class C, class A> static inline
        void resize(C c, A a) { }
};



} /* namespace data */
} /* namespace ivl */

#endif // IVL_CORE_DETAILS_DATA_MEMBER_CONTROL_HPP