Differences

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--- c_namespaces [2018/02/01 13:48] – [Terminology] rpjday
+++ c_namespaces [2018/02/01 14:50] (current) – [using-Directives] rpjday
@@ Line 40: / Line 40: @@
 namespace ATT = American_Telephone_and_Telegraph; // namespace alias
-</code>http://crashcourse.ca/dokuwiki/lib/images/toolbar/italic.png
+</code>
-Also, "... either a previously unused identifier, in which case this is //original-namespace-definition// or the name of a namespace, in which case this is //extension-namespace-definition//"
+Also, namespace identifier is "... either a previously unused identifier, in which case this is //original-namespace-definition// or the name of a namespace, in which case this is //extension-namespace-definition//."
 ===== Extensibility (namespaces are "open") =====
@@ Line 72: / Line 72: @@
 ==== using-Declarations ====
+Read [[http://en.cppreference.com/w/cpp/language/namespace#Using-declarations|this]] carefully.
 "makes the symbol name from the namespace ns_name accessible for unqualified lookup as if declared in the same class scope, block scope, or namespace as where this using-declaration appears."
@@ Line 93: / Line 95: @@
 }
 </code>
+Useful for introducing base class members into derived class definitions.
 ==== using-Directives ====
+cppreference.com link [[http://en.cppreference.com/w/cpp/language/namespace#Using-directives|here]].
 "From the point of view of unqualified name lookup of any name after a using-directive and until the end of the scope in which it appears, every name from ns_name is visible as if it were declared in the nearest enclosing namespace which contains both the using-directive and ns_name."