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1. header only library to help implemen... header only library to help implementing concept for a class

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   // This header only library is usued to check whether a class satisfies a concept.

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   // When compiling, an error will happen if the class doesn't satisfy the concept.

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   // IDEs like QtCreator and CLion will also display an error for it whiling editing.

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   // This is useful when you want to satisfy a concept by implementing methods one by one.

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   // (without checking the definition of the concept over time).