If g++ still gives error Try using: Look at this post: What is __gxx_personality_v0 for? Make sure -lstdc++ is at the end of the command. If you place it at the beginning (i.e. before file.c), you still can get this same error.
2D case Just like the dot product is proportional to the cosine of the angle, the determinant is proprortional to its sine. So you can compute the angle like this: The orientation of this angle matches that of the coordinate system. In a left-handed coordinate system, i.e. x pointing right and y down as is … Read more
Multiple definitions of “main” suggests that you have another definition of main. Perhaps in another .c or .cpp file in your project. You can only have one function with the same name and signature (parameter types). Also, main is very special so you can only have one main function that can be used as the … Read more
This works when I try from a single cpp file with a main function, How do I pass function arguments to sprintf within a class? The error message I get is: error C2276: ‘&’ : illegal operation on bound member function expression
What your teacher said is not true. cin will not “break”. It’s just that formatted extraction into an std::string is designed to read word by word. That’s intentional. It’s not broken. As for your error, your call to std::getline is broken because the delimiter argument has the wrong type. ‘\n’ is a char literal; “\n” … Read more
This is how things works: When you declare testApp like this class testApp : public Base { … };: normal non-virtual methods are inherited as they are declared inside Base, and are immutable. normal virtual methods are inherited as they are declared inside Base, you can use them >as they already are declared, or redefine … Read more
This is a circular dependency issue. For declaring a pointer to some class, the definition of the class is not needed; i.e. the type doesn’t have to be a complete type. So you don’t need to include A.h in B.h, forward declaration is enough. Such as:
Replace first match Use a combination of std::string::find and std::string::replace. Find the first match: Replace the first match: A simple function for your convenience: Usage: Demo. Replace all matches Define this O(n) method using std::ostringstream as a buffer: Usage: Demo. Boost Alternatively, use boost::algorithm::replace_all: Usage:
I google’d it and found these two: http://raydium.org/ and http://engine.nowhere-else.org/
I have two classes, and this is the header of one of them: I am calling Wrapper::set_screen(screen) from another file and I get this error: I also get a similar error for the definition of every single function on Wrapper.cpp, for example: On compile: I know it’s related to the class being static and thus … Read more