Stray ‘\342’ in C++ program
The symbol ” is not “. Those are called ‘smart quotes’ and are usually found in rich documents or blogs.
c++
got “cannot appear in a constant-expression” when using template
A non-type template argument needs to be a compile-time constant. Casting an int to a const int does not make it a compile-time constant. You either need to use 10 directly: or make i a const int:
casting int to char using C++ style casting
You should use static_cast<char>(i) to cast the integer i to char. reinterpret_cast should almost never be used, unless you want to cast one type into a fundamentally different type. Also reinterpret_cast is machine dependent so safely using it requires complete understanding of the types as well as how the compiler implements the cast. For more information about C++ casting see: When should static_cast, … Read more
C++ error: undefined reference to ‘clock_gettime’ and ‘clock_settime’
Add -lrt to the end of g++ command line. This links in the librt.so “Real Time” shared library.
The difference between cin.ignore and cin.sync
cin.ignore discards characters, up to the number specified, or until the delimiter is reached (if included). If you call it with no arguments, it discards one character from the input buffer. For example, cin.ignore (80, ‘\n’) would ignore either 80 characters, or as many as it finds until it hits a newline. cin.sync discards all … Read more
Class template inheritance C++
When inheriting you must show how to instantiate the parent template, if same template class T can be used do this: If something else is needed just change the line:
Python for C++ Developers
I never really understood the “Language X for Language Y developers” approach. When I go looking to learn Language X I want to learn how to program in it the way that Language X programmers do, not the way Language Y programmers do. I want to learn the features, idioms, etc. that are unique to … Read more
multiple definitions error in c++ and solution to solve this issue
) You solve this by ‘defining the class’ in only one cpp file. Why would you want to define it in two files? 2) Don’t define things in header files, only declare them. There are exceptions to this rule, for instance inline functions. Also classes themselves can defined more than once (by this I mean … Read more
C++ Global variable declaration
You must use extern, otherwise you will have separated bShouldRegister variables in each translation unit with probably different values. Put this in a header file (.h): Put this in one of implementation files (.cpp):
The system cannot find the file specified. in Visual Studio
The system cannot find the file specified usually means the build failed (which it will for your code as you’re missing a # infront of include, you have a stray >> at the end of your cout line and you need std:: infront of cout) but you have the ‘run anyway’ option checked which means … Read more