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Non-static variable cannot be referenced from a static context
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How do I fix this "identifier is not declared in the current scope" error?
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how to pass a non static-member function as a callback?
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How to pass variables by reference and by value
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Cannot make a static reference to the non-static method
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What is the difference between a static and a non-static initialization code block
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Question About Static Methods
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PHP: Static and non Static functions and Objects
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Xcode -dynamic not specified static library error
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Troubleshooting "program does not contain a static 'Main' method" when it clearly does...?
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c++ calling a non static function from a static function
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Using var outside of a method
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Why can't I initialize non-const static member or static array in class?
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When are static variables initialized?
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What does a "Cannot find symbol" or "Cannot resolve symbol" error mean?
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PHP Fatal error: Using $this when not in object context
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Reference - What does this error mean in PHP?