220 33237 <6e485787-ee7c-4271-88cc-90f42cf22e4f@isocpp.org> article
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From: "T. C." <rs2740@gmail.com>
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Subject: Re: Proposal "is_constexpr"
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>
> Gcc has a built-in function __builtin_constant_p (v) to determine whether 
> a value is a compile time constant, but it can only be used for macros, and 
> v can only be one literal.
>

That's so not how __builtin_constant_p works.

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<div dir=3D"ltr"><blockquote class=3D"gmail_quote" style=3D"margin: 0px 0px=
 0px 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">=
Gcc has a built-in function __builtin_constant_p (v) to determine whether a=
 value is a compile time constant, but it can only be used for macros, and =
v can only be one literal.<br></blockquote><br>That&#39;s so not how __buil=
tin_constant_p works.<br><br></div>

<p></p>

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