StackOverflow2013

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Id
15193815
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0
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2013-03-04T02:48:27.863
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2013-03-04T02:48:27.863
LastEditDate
2017-05-23T12:21:31.850
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15193527
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2
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text
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The cyclic dependency is bad: <pre><code>struct Singleton2; struct Singleton1 { static Singleton1 const& get() { static Singleton1 _instance; return _instance; } private: Singleton1(); Singleton2 const& _s2; }; struct Singleton2 { static Singleton2 const& get() { static Singleton2 _instance; return _instance; } private: Singleton2(); Singleton1 const& _s1; }; Singleton1::Singleton1() : _s2(Singleton2::get()) { } Singleton2::Singleton2() : _s1(Singleton1::get()) { } int main() { auto& s1 = Singleton1::get(); auto& s2 = Singleton2::get(); } </code></pre> Will result in a failure (see <a href="http://liveworkspace.org/code/4rPFDo$0" rel="nofollow noreferrer">http://liveworkspace.org/code/4rPFDo$0</a>). Like in all cases where you need to break cycles, make at least one link in the chain lazy. Solve it in the obvious way by not requiring a reference to the other singleton during construction: <pre><code>struct Singleton2; struct Singleton1 { static Singleton1 const& get() { static Singleton1 _instance; return _instance; } private: Singleton1() {} static Singleton2 const& getOther(); }; struct Singleton2 { static Singleton2 const& get() { static Singleton2 _instance; return _instance; } private: Singleton2() {} static Singleton1 const& getOther(); }; Singleton2 const& Singleton1::getOther() { return Singleton2::get(); } Singleton1 const& Singleton2::getOther() { return Singleton1::get(); } int main() { auto& s1 = Singleton1::get(); auto& s2 = Singleton2::get(); } </code></pre> Alternatively delay-initialize using boost::optional, boost::flyweight or a custom 'lazy_ptr': <a href="https://stackoverflow.com/a/878298/85371">https://stackoverflow.com/a/878298/85371</a>
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1. POstatic variable initialization
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1. USsehe
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