Can an array or function lvalue be converted to an rvalue?

According to C++ Standard 2003:

An lvalue (3.10) of a non-function, non-array type T can be converted to an rvalue.

What does i开发者_运维问答t mean that array and function cannot be converted to rvalue?

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Both function and array types are covered by later clauses (4.2, 4.3).

An lvalue or rvalue of type “array of N T” or “array of unknown bound of T” can be converted to an rvalue of type “pointer to T.” The result is a pointer to the first element of the array.

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An lvalue of function type T can be converted to an rvalue of type “pointer to T.” The result is a pointer to the function.