So, why do people always say std:: instead of ::std:: Probably because they never really had problems with ambiguity because of it. Along the same lines: I never had to include “earth” in my address, and I’m not going to. You have to draw the line somewhere, and this it is a reasonable assumption that … Read more
All of the standard library definitions are inside the namespace std. That is they are not defined at global scope, so in order to use them you need to qualify them in one of the following way: std::cout using namespace std using std::cout For instance lets take this: // declarations int global_variable; namespace n { … Read more
If I understand you correctly, ns-unmap should do what you want: user=> foo java.lang.Exception: Unable to resolve symbol: foo in this context (NO_SOURCE_FILE:1) user=> (def foo 1) #’user/foo user=> foo 1 user=> (ns-unmap (find-ns ‘user) ‘foo) nil user=> foo java.lang.Exception: Unable to resolve symbol: foo in this context (NO_SOURCE_FILE:1)
Use: module FooLib end module FooLib::Plugins end class FooLib::Plugins::Plugin; end #the base for plugins class FooLib::Plugins::Bar < FooLib::Plugins::Plugin; end class FooLib::Plugins::Bar2 < FooLib::Plugins::Plugin; end or in a different words: module FooLib module Plugins class Plugin; end #the base for plugins class Bar < Plugin; end class Bar2 < Plugin; end end end Also arrange the … Read more
::File Prefixing with :: accesses the ‘root’ of the namespace tree.
Overhead is not an issue, namespaces have some advantages though You can reopen a namespace in another header, grouping things more logically while keeping compile dependencies low You can use namespace aliasing to your advantage (debug/release, platform specific helpers, ….) e.g. I’ve done stuff like namespace LittleEndianHelper { void Function(); } namespace BigEndianHelper { void … Read more
dir() allows you to customize what attributes your object reports, by defining __dir__(). From the manual, if __dir__() is not defined: If the object is a module object, the list contains the names of the module’s attributes. If the object is a type or class object, the list contains the names of its attributes, and … Read more
Wheels I know this is an old question, but wheel packages have since been invented! Since a wheel is simply a zip file that gets extracted into the lib/site-packages directory, an examination of the contents of the wheel archive can give you the top level imports. >>> import zipfile >>> zf = zipfile.ZipFile(‘setuptools-35.0.2-py2.py3-none-any.whl’) >>> top_level … Read more