Some say use ' using namespace std', other say don't but rather prefix std functions that are to be used with ' std::' whilst others say use something like this: using std::string; using std::cout; …

Dec 16, 2014 · using std::cos;, using std::sin, etc. The issue though is that any well designed userlib is going to have their sin and cos inside their own namespace as well, so this really …

Sep 20, 2013 · When you make a call to using namespace <some_namespace>; all symbols in that namespace will become visible without adding the namespace prefix. A symbol may be …

Oct 13, 2015 · BTW a namespace C14_compatibility { namespace std { template <typename T> using decay_t = typename decay<T>::type; }} and using namespace C14_compatibility; seems …

In main() when it sees usage of the name vector, the previous using namespace std causes the compiler to look in std for names that match vector. It finds the std::vector, so uses that - and v …

Oct 21, 2008 · Writing using std::string is never OK. Writing using ImplementationDetail::Foo in your own header, when that header declares ImplementationDetail::Foo can be OK, moreso if …

Mar 9, 2011 · std::cout << 1; using std::cout; cout << 1; using namespace std; cout << 1; The reason you should avoid using is demonstrated with the above foo and baz namespaces. If …

Sep 22, 2023 · std::function. This is a declaration for a function taking no parameters, and returning no value. If the function returned an int, it would look like this: std::function<int()> …

Jan 19, 2016 · Неожиданный using namespace std, привнесённый в код заголовочным файлом, может всё поломать. Однако в cpp-файлах я всё время использую using …

Jun 24, 2011 · I try to avoid pollution of the global namespace as much as possible, but if I am writing a one-off, small implementation file I will add a using namespace std; at the top for …