45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoPrintable.h
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// (c) GeNeura Team, 1998
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//-----------------------------------------------------------------------------
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#ifndef EOPRINTABLE_H
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#define EOPRINTABLE_H
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//-----------------------------------------------------------------------------
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#include <iostream> // istream, ostream
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#include <string> // para string
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using namespace std;
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//-----------------------------------------------------------------------------
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// eoPrintable
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//-----------------------------------------------------------------------------
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/**
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Base class for objects that can print themselves
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(#printOn#). Besides, this file defines the standard output for all the objects;
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if the objects define printOn there's no need to define #operator <<#.\\
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This functionality was separated from eoObject, since it makes no sense to print
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some objects (for instance, a #eoFactory# or a random number generator.
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*/
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class eoPrintable
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{
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public:
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/// Virtual dtor. They are needed in virtual class hierarchies.
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virtual ~eoPrintable() {}
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/**
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* Write object. It's called printOn since it prints the object on a stream.
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* @param _os A ostream.
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*/
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virtual void printOn(ostream& _os) const = 0;
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};
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//-----------------------------------------------------------------------------
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///Standard output for all objects in the EO hierarchy
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ostream & operator << ( ostream& _os, const eoPrintable& _o );
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#endif EOPRINTABLE_H
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