Someone once hinted that doing this in a header file is not advised:
using namespace std;
Why is it not advised?
+6
A:
Because it forces anyone who uses your header file to bring the std namespace into global scope. This could be a problem if they have a class that has the same name as one of the standard library classes.
Eric Petroelje
2010-07-06 12:46:26
A:
If the file gets included elsewhere the compilation unit will implicitely get the using directive. This can lead to confusing errors when names overlap.
pmr
2010-07-06 12:46:30
could it cause linker errors like this: error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(void)" (??1?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in tools.lib(Exception.obj)??
Tony
2010-07-06 12:49:32
@Tony: You should add this to the question. It would be easier to read with proper formatting.
pmr
2010-07-06 12:58:33