[dcl.init]/7.1 Use of "initializer ()"
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Description
[dcl.init]/7.1 says:
To default-initialize an object of type T means:
- If T is a (possibly cv-qualified) class type ([class]), constructors are considered. The applicable constructors are enumerated ([over.match.ctor]), and the best one for the initializer () is chosen through overload resolution ([over.match]). The constructor thus selected is called, with an empty argument list, to initialize the object.
This usage requires that () be a valid value for the grammar term initializer. This is not the case according to the initializer definition:
initializer:
- brace-or-equal-initializer
- ( expression-list )
expression-list cannot be empty, so () is not a valid initializer.
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Research direction
Start by locating [dcl.init]/7.1 and the cited definition of initializer in the draft sources. Check whether the wording is consistent with the grammar for an empty initializer, then update the affected standard text and verify that the cross-references and generated draft remain correct.
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