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coppro
cf91f9c43b
git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@1438 0fc631ac-6414-0410-93d0-97cfa31319b6
64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
//+----------------------------------------------------------------------------+
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//| Description: Magic Set Editor - Program to make Magic (tm) cards |
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//| Copyright: (C) 2001 - 2010 Twan van Laarhoven and Sean Hunt |
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//| License: GNU General Public License 2 or later (see file COPYING) |
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//+----------------------------------------------------------------------------+
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#ifndef HEADER_UTIL_AGE
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#define HEADER_UTIL_AGE
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// ----------------------------------------------------------------------------- : Includes
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#include <util/prec.hpp>
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#include <util/dynamic_arg.hpp>
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#include <util/atomic.hpp>
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// ----------------------------------------------------------------------------- : Age
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/// Represents the age of a value, higher values are newer
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/** Age is counted using a global variable */
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class Age {
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public:
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/// Construct a new age value
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Age() {
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update();
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}
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/// Create a special age
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/** 0: dummy value, used for other purposes
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* 1: before 'beginning of time', the age conceptually just before program start
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* 2..: normal ages
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*/
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Age(AtomicIntEquiv age) : age(age) {}
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/// Update the age to become the newest one
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inline void update() {
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age = ++new_age;
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}
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/// Compare two ages, smaller means earlier
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inline bool operator < (Age a) const { return age < a.age; }
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/// Compare two ages
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inline bool operator == (Age a) const { return age == a.age; }
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/// A number corresponding to the age
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inline AtomicIntEquiv get() const { return age; }
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private:
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/// This age
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AtomicIntEquiv age;
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/// Global age counter, value of the last age created
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static AtomicInt new_age;
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};
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/// Age the object currently being processed was last updated
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/** NOTE:
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* image generating functions have two modes
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* if last_update_age > 0 they return whether the image is still up to date
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* if last_update_age == 0 they generate the image
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*/
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DECLARE_DYNAMIC_ARG (AtomicIntEquiv, last_update_age);
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// ----------------------------------------------------------------------------- : EOF
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#endif
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