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[dcl.fct.def.default] Restrictions on what comparison operator function can be explicitly defaulted CWG2547 #5337

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xmh0511 opened this issue Mar 8, 2022 · 1 comment
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[dcl.fct.def.default] Restrictions on what comparison operator function can be explicitly defaulted CWG2547 #5337

xmh0511 opened this issue Mar 8, 2022 · 1 comment
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@xmh0511
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xmh0511 commented Mar 8, 2022

[dcl.fct.def.default] p1 just states:

A function that is explicitly defaulted shall

  • be a special member function or a comparison operator function ([over.binary]), and
  • not have default arguments.

If I don't omit some other rules, there are no more restrictions on what the comparison operator function shall satisfy.

Consider this example:

enum E{};
bool operator==(E,E) = default;

This example directly causes GCC to crash while Clang reports some diagnoses for which I cannot find the corresponding wording in the standard.
@jensmaurer jensmaurer changed the title The restriction on what comparison operator function that can be explicitly defaulted [dcl.fct.def.default] Restrictions on what comparison operator function that can be explicitly defaulted Mar 8, 2022
@jensmaurer jensmaurer added the cwg Issue must be reviewed by CWG. label Mar 8, 2022
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@jensmaurer jensmaurer changed the title [dcl.fct.def.default] Restrictions on what comparison operator function that can be explicitly defaulted [dcl.fct.def.default] Restrictions on what comparison operator function that can be explicitly defaulted CWG2547 Mar 8, 2022
@jensmaurer jensmaurer changed the title [dcl.fct.def.default] Restrictions on what comparison operator function that can be explicitly defaulted CWG2547 [dcl.fct.def.default] Restrictions on what comparison operator function can be explicitly defaulted CWG2547 Mar 8, 2022
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