Concepts

Concepts is a term that describes properties of a type. They are used to specify requirements to the types that are passed to specific template.

There was a proposal to include formal specification of concepts into the C++ language, so that the compiler could check the types before template instantiation and in turn could have a chance to produce sensible error messages in case a type did not fulfil the template requirements. Unfortunately, the concepts were not accepted into the C++11 standard due to their complexity.

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Basic concepts