C++: What is best way to destruct this code? You mean to free resources. In case of unordered_map The way to do it right is not to do it. A unordered_map will automatically release resources when it’s destroyed for anything allocated automatically. Unless you allocated the values with new, you don’t delete them. In case … Read more
Visual Studio 2015 doesn’t support the C++17 standard. Prior to C++17 standard you can’t have the std::shared_ptr<T[]> pointer. But even in C++17 the std::make_shared function doesn’t support array types so you would have to use the boost::make_shared instead. Another alternative is to use the unique pointer in combination with the std::make_unique which does support the … Read more
why is this program taking integer and alpha numeric inputs and printing them? does std::string in c++ take integer values as well? [closed] solved why is this program taking integer and alpha numeric inputs and printing them? does std::string in c++ take integer values as well? [closed]
When for (int ai : a) std::cout << ai; is used for array – int a[20]; it can be substituted with for (int i = 0; i < sizeof(a) / sizeof(a[0]); i++) std::cout << a[i]; or with for (int *ai = a; ai < a + (sizeof(a)/sizeof(*a)); ai++) std::cout << *ai; But to work with … Read more
Just take int a =10; int *p = &a; a is a variable which holds value 10. The address in which this value is stored is given by &a. Now we have a pointer p , basically pointer points to some memory location and in this case it is pointing to memory location &a . … Read more
Its documentation states: ERRORS The getcwd() function shall fail if: [EINVAL] The size argument is 0. [ERANGE] The size argument is greater than 0, but is smaller than the length of the pathname +1. The getcwd() function may fail if: [EACCES] Read or search permission was denied for a component of the pathname. [ENOMEM] Insufficient … Read more
The purpose of public and private on a class differs from that on methods. Classes (C# Programming Guide) public class Customer { //Fields, properties, methods and events go here… } The class keyword is preceded by the access level. Because public is used in this case, anyone can create objects from this class. Access Modifiers … Read more
This will create a new XElement under the Root node which is where I think you want it. xmlDoc.Root.Add( new XElement(“product”, new XElement(“name”, “456”), new XElement(“price”, “456”))); 0 solved C# problem in append items to XML document
In foo() and foo2() you are returning pointers to local variables. These locals have automatic storage and it is undefined behavior to use a pointer to them once they go out of scope. Therefor p and p2 contain nothing useful. It might work, it might not. I can’t understand your question very well, so I … Read more
You have mentioned Rhino Mocks, NUnit and TestDriven. I would not compare these against one another. However you can compare each of these with its counterparts. Here is a start! – I tried to include links for comparisons Unit testing Frameworks NUnit MsTest MBUnit xUnit NUnit vs. MbUnit vs. MSTest vs. xUnit.net I slightly prefer … Read more
The other answers have shown how you can (and should, IMO) do this without LINQ – but they’ve both still got the same problem that your original code does: you’re only checking whether the data set has any tables – it could have fewer than tableNo tables. I would suggest: public bool IsNullOrEmptyDataTable(DataSet objDataset, int … Read more
Are you looking for this? var tupleList = new List<Tuple<string, string>>(); for (int i = 0; i < data.Count; i++) { for (int j = i + 1; j < data.Count; j++) { tupleList.Add(new Tuple<string, string>(data[i], data[j])); } } 1 solved Combine elements of a list [closed]
You never assigned a variable to area and radius You’re using the radius variable to calculate the area but radius doesn’t have a value; it was never initialized. Simply typing double radius = 0.0; would fix it. It is good practice to set (initialize) your variables to something when you declare them. 2 solved Complete … Read more
And the program knows that you’re talking about the courseName variable. How is this possible since they are two different variables One was copied into the other, by virtue of passing it to a function. This is how functions work. Consult the first couple of chapters of your C++ book for more info. How does … Read more
It’s undefined behavior to use the value of an uninitialized (auto) variable that could have been declared with the register keyword (see 6.3.2.1p2 in the C standard). int XY; could have been declared with register (you’re not taking its address anywhere) and it’s still unitialized at the right hand side of int XY = XY;, … Read more