也就是说，不要这样做:usingnamespacestd;// avoid as too indiscriminate(随意)而应这样做intx;std:...
Example(原因) // bad.h #include <iostream> using namespace std; // bad // user.cpp #include "bad.h" bool copy(/*... some parameters ...*/); // some function that happens to be named copy int main() { copy(/*...*/); // now overloads local ::copy and std::copy, cou...
对于What requires me to declare “using namespace std;”? Péter Török给出了这样的解释 However, usingnamespacestd; is considered a bad practice because you are practically importing the whole standard namespace,thus opening up a lot of possibilities for name clashes. It is better to impor...
一直我都告诫学习C++的人 以后精通了C++就不要用using namespace std;了 如使用 如using std::cin;...
// bad.h#include<iostream>using namespace std;// bad// user.cpp#include"bad.h"boolcopy(/*... some parameters ...*/);// some function that happens to be named copyintmain(){copy(/*...*/);// now overloads local ::copy and std::copy, could be ambiguous} ...
If you had usedfoo::Blah()andbar::Quux(), then the introduction offoo::Quux()would have been a non-event. 参考: why-is-using-namespace-std-considered-bad-practice
usingnamespacestd; See every other code review. But you can find a detailed explanation here:Why is “using namespace std” considered bad practice? Comments. Useless comments are worse than no comments. The trouble with comments is that they need to be maintained (hence the concept ...
using namespace std;is considered bad practice. Instead ofsum=sum+temp[i];it's more natural to writesum += temp[i];. Headers Since you're usingstd::int64_t, you need to add #include<cstdint> You may be getting away without it on your current compiler, if the definition is included...
usingnamespaceconcurrency;usingnamespacestd;usingnamespaceWeb; In MainPage.xaml.cpp, implement theGetButton_Click,PostButton_Click, andCancelButton_Clickmethods of theMainPageclass. C++ voidMainPage::GetButton_Click(Object^ sender, RoutedEventArgs^ e) {// Create a new cancellation token source for...
using namespace std;using namespace tbb; template <class T>class Body { T reduced_result; T* const y; const T* const x; public: Body( T y_[], const T x_[] ) : reduced_result(0), x(x_), y(y_) {} T get_reduced_result() const {return reduced_result;} template<typenam...