include/cinder/Function.h

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/*
 Copyright (c) 2010, The Cinder Project (http://libcinder.org)
 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.

 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 HOLDER 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.
*/

#pragma once

#include "cinder/Cinder.h"

#include <algorithm>
#include <vector>
#include <utility>

#include <boost/signals2.hpp>
namespace cinder { namespace signals {
    using namespace boost::signals2;
} } // cinder::signals

#include <functional>
namespace std {
    using namespace std::placeholders;
}

namespace cinder {

typedef uint32_t CallbackId;

template<typename SIG>
class CallbackMgr {
  public:
    typedef typename std::vector<std::pair<CallbackId,std::function<SIG> > >    collection;
    typedef typename collection::iterator                                       iterator;
    
    CallbackId  registerCb( std::function<SIG> cb )
    {
        CallbackId cbId = 0;
        if( ! mCallbacks.empty() )
            cbId = mCallbacks.rbegin()->first + 1;
        mCallbacks.push_back( std::make_pair( cbId, cb ) );
        return cbId;    
    }

    CallbackId  registerCb( iterator position, std::function<SIG> cb )
    {
        CallbackId cbId = 0;
        if( ! mCallbacks.empty() )
            cbId = mCallbacks.rbegin()->first + 1;
        mCallbacks.insert( position, std::make_pair( cbId, cb ) );
        return cbId;    
    }

    void call() { for( iterator it = begin(); it != end(); ++it ) it->second(); }
    template<typename A1>
    void call( A1 a1 ) { for( iterator it = begin(); it != end(); ++it ) it->second( a1 ); }
    template<typename A1, typename A2>
    void call( A1 a1, A2 a2 ) { for( iterator it = begin(); it != end(); ++it ) it->second( a1, a2 ); }
    template<typename A1, typename A2, typename A3>
    void call( A1 a1, A2 a2, A3 a3 ) { for( iterator it = begin(); it != end(); ++it ) it->second( a1, a2, a3 ); }
    template<typename A1, typename A2, typename A3, typename A4>
    void call( A1 a1, A2 a2, A3 a3, A4 a4 ) { for( iterator it = begin(); it != end(); ++it ) it->second( a1, a2, a3, a4 ); }
    template<typename A1, typename A2, typename A3, typename A4, typename A5>
    void call( A1 a1, A2 a2, A3 a3, A4 a4, A5 a5 ) { for( iterator it = begin(); it != end(); ++it ) it->second( a1, a2, a3, a4, a5 ); }
    
    void    unregisterCb( CallbackId cbId ) { mCallbacks.erase( find( cbId ) ); }
    
    bool    empty() const { return mCallbacks.empty(); }

    iterator find( CallbackId cbId ) { for( iterator it = begin(); it != end(); ++it ) if( it->first == cbId ) return it; return mCallbacks.end(); }
    iterator begin() { return mCallbacks.begin(); }
    iterator end() { return mCallbacks.end(); }  

    collection&     getCallbacks() { return mCallbacks; }

  private:
    collection      mCallbacks;
};

} // namespace cinder