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A bare-bones approach would be to add the directive

#hide *integral-expression*

which, if the expression is non-zero, would hide all definitions that did
not being with the prefix MACRO_ .  (Hiding disabled when the expression
was zero.)  All preprocessor definitions specified by the Standard would
have a synonym added with the reserved prefix MACRO_STD_ .

A more general approach would be to add the directives

#push [ *identifier* ] [ * ]
#push_except [ *identifier* ] [ * ]

which would push definitions onto per-name "hide stacks".  The asterisk
means push all names having the identifier as a prefix.  Omitting the
identifier, or the identifier and the asterisk, would mean push all
currently-defined names.  Unhiding names would be accomplished with
corresponding pop directives

#pop [ *identifier* ] [ * ]
#pop_except [ *identifier* ] [ * ]

Popping an unpushed name would have no effect.

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<div dir=3D"ltr">A bare-bones approach would be to add the directive<div><b=
r></div><div>#hide <i>integral-expression</i></div><div><i><br></i></div><d=
iv>which, if the expression is non-zero, would hide all definitions that di=
d not being with the prefix MACRO_ . =C2=A0(Hiding disabled when the expres=
sion was zero.) =C2=A0All preprocessor definitions specified by the Standar=
d would have a synonym added with the reserved prefix MACRO_STD_ .</div><di=
v><br></div><div>A more general approach would be to add the directives</di=
v><div><br></div><div>#push [ <i>identifier</i>=C2=A0] [ * ]</div><div>#pus=
h_except [ <i>identifier</i>=C2=A0] [ * ]</div><div><br></div><div>which wo=
uld push definitions onto per-name &quot;hide stacks&quot;. =C2=A0The aster=
isk means push all names having the identifier as a prefix. =C2=A0Omitting =
the identifier, or the identifier and the asterisk, would mean push all cur=
rently-defined names. =C2=A0Unhiding names would be accomplished with corre=
sponding pop directives</div><div><br></div><div><div>#pop [=C2=A0<i>identi=
fier</i>=C2=A0] [ * ]</div><div>#pop_except [=C2=A0<i>identifier</i>=C2=A0]=
 [ * ]</div></div><div><br></div><div>Popping an unpushed name would have n=
o effect.</div></div>

<p></p>

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om/a/isocpp.org/d/msgid/std-proposals/bf7f7d07-ca2b-457e-ba7e-46dadb0a62c4%=
40isocpp.org?utm_medium=3Demail&utm_source=3Dfooter">https://groups.google.=
com/a/isocpp.org/d/msgid/std-proposals/bf7f7d07-ca2b-457e-ba7e-46dadb0a62c4=
%40isocpp.org</a>.<br />

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