29 lines
1.9 KiB
Markdown
29 lines
1.9 KiB
Markdown
[namespace.unnamed]
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# 9 Declarations [[dcl]](./#dcl)
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## 9.9 Namespaces [[basic.namespace]](basic.namespace#namespace.unnamed)
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### 9.9.2 Namespace definition [[namespace.def]](namespace.def#namespace.unnamed)
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#### 9.9.2.2 Unnamed namespaces [namespace.unnamed]
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/declarations.tex#L8373)
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An [*unnamed-namespace-definition*](namespace.def.general#nt:unnamed-namespace-definition "9.9.2.1 General [namespace.def.general]") behaves as if it were
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replaced by
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inlineopt namespace *unique* { /* empty body */ }
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using namespace *unique* ;
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namespace *unique* { [*namespace-body*](namespace.def.general#nt:namespace-body "9.9.2.1 General [namespace.def.general]") }
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whereinline appears if and only if it appears in the[*unnamed-namespace-definition*](namespace.def.general#nt:unnamed-namespace-definition "9.9.2.1 General [namespace.def.general]") and all occurrences of *unique* in a translation unit are replaced by
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the same identifier, and this identifier differs from all other
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identifiers in the program[.](#1.sentence-1)
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The optional [*attribute-specifier-seq*](dcl.attr.grammar#nt:attribute-specifier-seq "9.13.1 Attribute syntax and semantics [dcl.attr.grammar]") in the [*unnamed-namespace-definition*](namespace.def.general#nt:unnamed-namespace-definition "9.9.2.1 General [namespace.def.general]") appertains to *unique*[.](#1.sentence-2)
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[*Example [1](#example-1)*: namespace { int i; } // *unique*::ivoid f() { i++; } // *unique*::i++namespace A {namespace {int i; // A::*unique*::iint j; // A::*unique*::j}void g() { i++; } // A::*unique*::i++}using namespace A;void h() { i++; // error: *unique*::i or A::*unique*::i A::i++; // A::*unique*::i j++; // A::*unique*::j} â *end example*]
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