C++ float array initialization
You only initialize the first N positions to the values in braces and all others are initialized to 0. In this case, N is the number of arguments you passed to the initialization list, i.e.,
C++
Template constructor in a class template – how to explicitly specify template argument for the 2nd parameter?
Fixing your code, the following would work: You cannot use T for the class template parameter and the constructor template parameter. But, to answer your question, from [14.5.2p5]: Because the explicit template argument list follows the function template name, and because conversion member function templates and constructor member function templates are called without using a function name, there is … Read more
Differences between unique_ptr and shared_ptr
Both of these classes are smart pointers, which means that they automatically (in most cases) will deallocate the object that they point at when that object can no longer be referenced. The difference between the two is how many different pointers of each type can refer to a resource. When using unique_ptr, there can be at … Read more
-Error reading characters of string
4 getCarName likely returns a temporary. After the assignment the temporary object is destroyed and the pointer item.pszText points to invalid memory. You must ensure that the string object is valid during the call to ListView_InsertItem. The const_cast is an artifact of the fact that the Windows API uses the same structure to set and … Read more
Conversion from ‘myItem*’ to non-scalar type ‘myItem’ requested
Try: But do not forget to delete it after usage:
“Cannot allocate an object of abstract type” error
In C++ a class with at least one pure virtual function is called abstract class. You can not create objects of that class, but may only have pointers or references to it. If you are deriving from an abstract class, then make sure you override and define all pure virtual functions for your class. From … Read more
Getting the error floating point exception: 8
There is overflow, long can’t hold that big number. see this link try: Edit: You can’t % against 0, i starts from 0 } Minor change to a working version:
How do you clear a stringstream variable?
For all the standard library types the member function empty() is a query, not a command, i.e. it means “are you empty?” not “please throw away your contents”. The clear() member function is inherited from ios and is used to clear the error state of the stream, e.g. if a file stream has the error … Read more
I’m getting the error “stoi is not a member of std” in myprogramminglab [duplicate]
edit: this question has been marked as a duplicate. I did indeed look through all the previous similar questions I could find and haven’t found an answer. Basically, I am not able to control how the program compiles (though I think it’s already using c++11), so I’m either looking for a reason why stoi isn’t … Read more
One or more multiply defined symbols found
Put the definition (body) in a cpp file and leave only the declaration in a h file. Include guards operate only within one translation unit (aka source file), not across all your program. The One Definition Rule of the C++ standard states that there shall appear exactly one definition of each non-inline function that is … Read more