You can use forward declaration of your class second and use a pointer. Only the implementation must know the declaration of your class Second. namespace A { class Second; // Forward declaration class First { public: First(); ~First(); private: Second* s; // Pointer on a forward class }; class Second { private: First f; }; … Read more
You are using QString, and QString is not from std namespace. When you directly type std::QString you will get an error, because QString is not defined in std namespace, but when you type using namespace std, You can use everything from std namespace without directly typing std (what is defined in that namespace), but not … Read more
How do I register a Pivotal Cloud Foundry Service Broker to make it accessible from multiple spaces within the same Organization, if I have Org-level permissions? I don’t think you can do this. You’d need to be a platform admin/operator. Then you’d need to register the service broker with the platform & mark that broker … Read more
try this code : Using sqlConnection As SqlConnection = New SqlConnection(Utilities.ConnectionString) End Using 2 solved How can I convert using statement in vb syntax [closed]
This will not work, as Show is an instance method, not a static mathod: register form = new register(); register.Show(); You probably meant: register form = new register(); form.Show(); Note: Your naming is non standard – types in .NET are normally in PascalCase – to be consistent, your should name the class Register. Additionally, using … Read more
Every #include directive including something from the C++ standard library “loads” the entities into the std namespace (or some other namespace like this). The namespace helps preventing global namespace pollution – by keeping everything in a seperate namespace, identifier collisions are rendered impossible. In the <vector> file, then there is something like namespace std { … Read more
Short Answer It’s boilerplate code that protects users from accidentally invoking the script when they didn’t intend to. Here are some common problems when the guard is omitted from a script: If you import the guardless script in another script (e.g. import my_script_without_a_name_eq_main_guard), then the latter script will trigger the former to run at import … Read more
There are plenty of differences. A namespace is a grouping mechanism for names, nothing more or less. On the other hand, classes: Are types. Can be instantiated. Can be derived from. Can have public, protected, and private members. Can have virtual functions. And so on. If you find yourself wondering whether you should use a … Read more
Introduction If __name__ == “__main__”: is a special statement in Python that is used to execute some code only if the file is run directly. This statement is used to check whether the current file is being imported from another module or not. If the file is being imported from another module, the code inside … Read more
Short Answer It’s boilerplate code that protects users from accidentally invoking the script when they didn’t intend to. Here are some common problems when the guard is omitted from a script: If you import the guardless script in another script (e.g. import my_script_without_a_name_eq_main_guard), then the latter script will trigger the former to run at import … Read more
Introduction Using the “using namespace std;” statement in C++ is a controversial topic among developers. While it can be a convenient way to access the standard library, it can also lead to confusion and errors. In this article, we will discuss why using namespace std; is considered bad practice and what alternatives are available. We … Read more
Consider two libraries called Foo and Bar: using namespace foo; using namespace bar; Everything works fine, and you can call Blah() from Foo and Quux() from Bar without problems. But one day you upgrade to a new version of Foo 2.0, which now offers a function called Quux(). Now you’ve got a conflict: Both Foo … Read more