cplusplus / cplusplus/draft

[expr.mtr.oper]/6 refers to "the operand for the function call operator", as if there can only be one

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Description

[expr.mptr.oper]/6 says

If the result of .* or ->* is a function, then that result can be used only as the operand for the function call operator ().

which suggests that a function call operator only has one operand, and that the argument expressions don't count. This is not consistent with [expr.ref]/6.3.2, which refers to "the left-hand operand of a member function call".

The wording of [expr.mptr.oper]/6 should be changed to also say "left-hand operand".

In case there is any doubt that the argument expressions should be considered operands, consider [intro.execution]/3.1. If we consider argument expressions to be operands, then [intro.execution]/3.1 implies that they are subexpressions of the function call expression. This is obviously what was intended.

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Research direction

Locate the TeX source for [expr.mptr.oper]/6 and compare its wording with the cited text from [expr.ref]/6.3.2. Change the sentence to identify the left-hand operand, then check the resulting draft wording to confirm that argument expressions remain covered as operands.

Written by the indexing model from the issue text.

Assessment

Tech stack
tex
Domain
documentation
Issue type
Documentation
Difficulty
1/5
Estimated time
Under an hour
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
55/100

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