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yo/classtemplates/perfect.yo

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Another example is found in em(factory functions) that also frequently forward

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their parameters to the constructors of objects that they return.

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Before the C++0x standard the interfaces of overloaded functions needed to

 

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Before the C++11 standard the interfaces of overloaded functions needed to

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be duplicated by the forwarding entity: tt(Inserter) needed to duplicate the

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interfaces of all five tt(string::insert) members; a factory function needed

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to duplicate the interfaces of the constructors of the class of the objects it

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returned.

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The C++0x standard simplifies and generalizes forwarding of parameters by

 

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The C++11 standard simplifies and generalizes forwarding of parameters by

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offering emi(perfect forwarding), implemented through rvalue references and

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variadic templates. With perfect forwarding the arguments passed to functions

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are `perfectly forwarded' to nested functions. Forwarding is called

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