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GenevensiS
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
//+----------------------------------------------------------------------------+
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//| Description: Magic Set Editor - Program to make card games |
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//| Copyright: (C) Twan van Laarhoven and the other MSE developers |
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//| License: GNU General Public License 2 or later (see file COPYING) |
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//+----------------------------------------------------------------------------+
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#pragma once
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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 <cstdint>
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#include <atomic>
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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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typedef uint_fast64_t age_t;
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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(age_t 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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/// 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 age_t get() const { return age; }
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private:
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/// This age
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age_t age;
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/// Global age counter, value of the last age created
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static atomic<age_t> 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(Age::age_t, last_update_age);
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