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cppdraft/cpp/scope.md

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+[cpp.scope]
+
+# 15 Preprocessing directives [[cpp]](./#cpp)
+
+## 15.7 Macro replacement [[cpp.replace]](cpp.replace#cpp.scope)
+
+### 15.7.6 Scope of macro definitions [cpp.scope]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/preprocessor.tex#L2040)
+
+A macro definition lasts
+(independent of block structure)
+until a corresponding#undef directive is encountered or
+(if none is encountered)
+until the end of the translation unit[.](#1.sentence-1)
+
+Macro definitions have no significance after translation phase 4[.](#1.sentence-2)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/preprocessor.tex#L2050)
+
+A preprocessing directive of the form
+
+# undef [*identifier*](lex.name#nt:identifier "5.11 Identifiers [lex.name]") [*new-line*](cpp.pre#nt:new-line "15.1 Preamble [cpp.pre]")
+
+causes the specified identifier no longer to be defined as a macro name[.](#2.sentence-1)
+
+It is ignored if the specified identifier is not currently defined as
+a macro name[.](#2.sentence-2)