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Question: Given an Iterator is there any way to check if its valid in C++

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For example:

//returns true if 'itr' is de-referencable and point to a valid item
template<typename Iterator>
bool isValid(Iterator itr){
/* implementation */
}

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I don't believe there is a standard way to do this.

MSVC++ has checked iterator support (and other SC++L implementations might as well) but it would take a really platform-specific hack to make use of it to do what you describe.

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