Changeset - r269:f5965bbf1353
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kpeter (Peter Kovacs)
kpeter@inf.elte.hu
Improvements in named-param.dox (ticket #147)
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1 file changed with 11 insertions and 11 deletions:
doc/named-param.dox
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doc/named-param.dox
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/* -*- C++ -*-
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/* -*- mode: C++; indent-tabs-mode: nil; -*-
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 *
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 * This file is a part of LEMON, a generic C++ optimization library
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 * This file is a part of LEMON, a generic C++ optimization library.
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 *
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 * Copyright (C) 2003-2008
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 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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Several modern languages provide a convenient way to refer the
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function parameters by name also when you call the function. It is
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especially comfortable in case of a function having tons of parameters
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with natural default values. Sadly, C++ lack this amenity.
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with natural default values. Sadly, C++ lack this amenity.
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However, with a crafty trick and with some little


			




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inconvenience, it is possible to emulate is.


			




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The example below shows how to do it.


			




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\code


			




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class namedFn 


			




	
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class namedFn


			




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{


			




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  int _id;


			




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  double _val;


			




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  int _dim;


			




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  public:


			




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  namedFn() : _id(0), _val(1), _dim(2) {}


			




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  namedFn& id(int p)     { _id  = p ; return *this; }


			




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  namedFn& dim(int p)    { _dim = p ; return *this; }


			




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  run() {


			




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  std::cout << "Here comes the function itself\n" <<


			




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            << "With parameters "


			




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            << _id << ", " << _val << ", " << _dim << std::endl; 


			




	
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    std::cout << "Here comes the function itself\n" <<


			




	
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              << "With parameters "


			




	
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              << _id << ", " << _val << ", " << _dim << std::endl;


			




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  }


			




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};


			




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\endcode


			




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\section named-templ-func-param Named Function Template Parameters


			




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A named parameter can also be a template functions. The usage is


			




	
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A named parameter can also be a template function. The usage is


			




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exactly the same, but the implementation behind is a kind of black


			




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magic and they are the dirtiest part of the LEMON code.


			




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be used as shown in the following example.


			




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\code


			




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Dijkstra<>::SetPredNodeMap<NullMap<Node,Node> >::Create


			




	
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Dijkstra<>::SetPredMap<NullMap<Node,Arc> >::Create


			




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\endcode


			




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It can also be used in conjunction with other named template


			




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parameters in arbitrary order.


			




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\code


			




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Dijkstra<>::SetDistMap<MyMap>::SetPredMap<NullMap<Node,Edge> >::Create


			




	
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Dijkstra<>::SetDistMap<MyMap>::SetPredMap<NullMap<Node,Arc> >::Create


			




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\endcode


			




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The result will be an instantiated Dijkstra class, in which the


			




        

    






    
    



    


    

     
    
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