Namespaces in C++ header files
<p>I like the concept of C++ namespaces, because they help to keep the source code concise while avoiding name conflicts. In .cpp files this works very well, using the "using namespace" declaration. However, in header files this cannot be used, as it "breaks open" the namespace, meaning that the "using namespace" not only applies within the current header file, but to everything that is compiled thereafter. This partly nullifies the advantage of namespaces. Consider for example a header file in which the classes "ourlib::networking::IpAddress" and "ourlib::filesystem::Path" are frequently used.</p>

<p>Is there a way to limit the effect of the "using namespace"-declaration in header files?</p>
