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say goodbye to filesyscheck.cfg when you start the game, and i have.q: c++ singleton with different constructors – is this thread safe? assume i have a singleton class that has two constructors. both constructors have to create some global data. this is the class: class singleton { public: singleton(); singleton(const singleton &); singleton(const singleton&, const singleton *); private: static singleton instance; }; is this thread safe (as in multithreaded). in particular the same, might run into this problem: http://www.parashift.com/c++-faq-lite/shared-objects.html#faq-16.13 a: yes it’s thread safe; however if you do create with the same instance as the first constructor, you will have a static copy of your data. to resolve this, you need a copy constructor and copy assignment operator: class singleton { public: singleton(); singleton(const singleton &); singleton(const singleton&, const singleton *); singleton(const singleton&); // copy construct with same instance. singleton& operator=(const singleton&); // copy assign private: static singleton instance; }; you need to check whether the object already exists first and create the new one if it doesn’t. you can do this using the constructor: singleton& singleton::operator=(const singleton& rhs) { if (!instance) instance = rhs; return *this; } because you have two constructors you need to ensure that the copy constructor and assignment operator for the class itself are called at initialization time, not at any other point. a: you are right: it’s safe, but if you construct an object, that object will own the same singleton instance. it’s perfectly safe to use on a single thread, though, so you don’t need to worry. but if you want to do this safely, and don’t care about sharing data within each constructor, then you need to make an additional copy constructor: class singleton { public: singleton(); singleton(const singleton &); singleton(const singleton&, const singleton *); singleton(const singleton&, const singleton&); private: static singleton instance; }; singleton::singleton() : instance(this) { } then you’ll have to rely on reference counting within the constructor(s) to get rid of the copies. a: no, it’s not thread-safe. create a singleton instance in your main thread, do something with it (i’m doing this in an example). then, from a different thread, you need to create a new instance and replace it with the first instance.
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