Assuming that earlier code has already split up the line into individual numbers, then the check you want is strtol will never set endtoken to a null pointer; it will set it to point to the first character that is not a digit. If that character is the NUL string terminator (note the slightly different … Read more
Anyone know how to convert a char array to a single int?
1) Make a vector from your orig point to the point of interest: v = point-orig (in each dimension); 2) Take the dot product of that vector with the unit normal vector n: dist = vx*nx + vy*ny + vz*nz; dist = scalar distance from point to plane along the normal 3) Multiply the unit … Read more
It means that you have a memory error. You may be trying to free a pointer that wasn’t allocated by malloc (or delete an object that wasn’t created by new) or you may be trying to free/delete such an object more than once. You may be overflowing a buffer or otherwise writing to memory to which you shouldn’t be writing, causing heap corruption. Any … Read more
C++03 3.10/1 says: “Every expression is either an lvalue or an rvalue.” It’s important to remember that lvalueness versus rvalueness is a property of expressions, not of objects. Lvalues name objects that persist beyond a single expression. For example, obj , *ptr , ptr[index] , and ++x are all lvalues. Rvalues are temporaries that evaporate at the end of the full-expression in which … Read more
The type of pointer-to-member-function is different from pointer-to-function. The type of a function is different depending on whether it is an ordinary function or a non-static member function of some class: And Note: if it’s a static member function of class Fred, its type is the same as if it were an ordinary function: “int (*)(char,float)” In C++, member functions have … Read more
This error is being thrown for the same reason you can’t do something like this: Your version of Vector::at should be returning a reference rather than a value.Lvalues are called Lvalues because they can appear on the left of an assignment. Rvalues cannot appear on the left side, which is why we call them rvalues. You can’t … Read more
In C++, unlike (say) Java, an instance of a nested class doesn’t intrinsically belong to any instance of the enclosing class. So bar::getA doesn’t have any specific instance of foo whose a it can be returning. I’m guessing that what you want is something like: But even for this you may have to make some changes, because in versions of C++ … Read more
The #ifdef directive is used to check if a preprocessor symbol is defined. The standard (C11 6.4.2 Identifiers) mandates that identifiers must not start with a digit: The correct form for using the pre-processor to block out code is: You can also use: but you need to be confident that the symbols will not be inadvertently set by code … Read more
Right from the docs: -fpermissiveDowngrade some diagnostics about nonconformant code from errors to warnings. Thus, using -fpermissive will allow some nonconforming code to compile. Bottom line: don’t use it unless you know what you are doing!