WebApr 26, 2024 · 不要在header里有任何的 using xxx; 统一只在.cpp 中使用using。 即便是在.cpp 中,也不要 using namespace xxx; 这是个非常糟糕的c++设计。会让读code人很抓狂(尤其是在大型工程中)。 如果你想要handle different name的话,推荐这样: using libA = xxx::yyy::zzz::longNameOfLibA; WebSep 5, 2016 · c语言using namespace std什么意思. 在标准C++以前,都是用#include< iostream.h >这样的写法的,因为要包含进来的头文件名就是 iostream.h 。. 标准C++引入了 名字空间 的概念,并把iostream等标准库中的东东封装到了std 名字空间 中,同时为了不与原来的头文件混淆,规定标准 ...
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WebJul 30, 2024 · So they created a namespace, std to contain this change. The using namespace statement just means that in the scope it is present, make all the things under the std namespace available without having to prefix std:: before each of them. While this practice is okay for short example code or trivial programs, pulling in the entire std … WebJan 24, 2024 · In this code of operator Overloading, i don't want to write "using namespace std" instead i want to include "std::" wherever required. After adding "std::" after cout … fly glitch in build a boat for treasure
Why is "using namespace std;" considered bad practice?
WebНеожиданный using namespace std, привнесённый в код заголовочным файлом, может всё поломать. Однако в cpp-файлах я всё время использую using namespace std. И сплю при этом совершенно спокойно. WebSep 21, 2009 · The problem with putting using namespace in the header files of your classes is that it forces anyone who wants to use your classes (by including your header files) to also be 'using' (i.e. seeing everything in) those other namespaces. However, you may feel free to put a using statement in your (private) *.cpp files. WebMay 1, 2011 · A using directive brings in all the buddies in the namespace. Your teachers' use of using namespace std; is a using directive. More seriously, we have namespaces to avoid name clash. A header file is intended to provide an interface. Most headers are agnostic of what code may include them, now or in the future. greenleaf rehab facility