mirror of
https://github.com/liyunfan1223/mod-playerbots.git
synced 2026-02-21 02:20:00 +01:00
6cf7f1aaef
- Did some basic formatting - Some generated docs - Cleaned header/impl Helper.css - Moved PerfMonitor from util to bot/handler/command Still a freaking mess though, but its a start i guess. Cant ask ppl to add more or make use of those when its so messy.
75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
/*
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* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license, you may redistribute it
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* and/or modify it under version 3 of the License, or (at your option), any later version.
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*/
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#ifndef _PLAYERBOT_LAZYCALCULATEDVALUE_H
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#define _PLAYERBOT_LAZYCALCULATEDVALUE_H
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/**
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* @brief Lazy calculation helper.
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*
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* Stores a function pointer (calculator) and its owner instance, and
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* calculates the value only when it is requested for the first time.
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* The result is cached until Reset() is called.
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*
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* @tparam TValue Type of the calculated value.
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* @tparam TOwner Type of the owner class containing the calculator function.
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*/
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template <class TValue, class TOwner>
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class LazyCalculatedValue
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{
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public:
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/**
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* @brief Type of the calculator function.
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*
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* This is a pointer to a member function of TOwner returning TValue.
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*/
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typedef TValue (TOwner::*Calculator)();
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public:
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/**
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* @brief Constructor.
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*
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* @param owner Pointer to the owner object.
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* @param calculator Pointer to the member function used to calculate the value.
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*/
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LazyCalculatedValue(TOwner* owner, Calculator calculator) : calculator(calculator), owner(owner) { Reset(); }
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public:
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/**
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* @brief Get the cached value or calculate it if needed.
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*
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* If the value has not been calculated yet, it calls the calculator
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* on the owner and caches the result.
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*
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* @return TValue The calculated or cached value.
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*/
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TValue GetValue()
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{
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if (!calculated)
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{
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value = (owner->*calculator)();
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calculated = true;
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}
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return value;
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}
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/**
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* @brief Reset the cached state.
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*
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* After calling Reset(), the next call to GetValue() will recalculate
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* the value again.
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*/
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void Reset() { calculated = false; }
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protected:
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Calculator calculator; ///< Pointer to calculator member function
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TOwner* owner; ///< Owner instance
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bool calculated; ///< Whether value has already been calculated
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TValue value; ///< Cached value
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};
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#endif
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