In C++03, an expression is either an rvalue or an lvalue. In C++0x, an expression can be an: rvalue lvalue xvalue glvalue prvalue Two categories have become five categories. What are these new categories of expressions? How do these new categories relate to the existing rvalue and lvalue categories? Are the rvalue and lvalu...
While trying to understand Rvalue references from here, I am unable to understand two things If there are N strings in the vector, each copy could require as many as N+1 memory allocations and [...] What is this +1 in 'N+1'? 2.How the author suddenly arrives at the below guideline Guideline: Don’t copy your function ...
Possible Duplicates: What are rvalues, lvalues, xvalues, glvalues, and prvalues? lvalue and rvalue difference between c's expression and c++'s expression On executing the program below, I got error an message like "required Lvalue is missing in main function" main() { int i; printf("%d",++i++); } Please tell me ...
$4.2/1 - "An lvalue or rvalue of type “array ofN T” or “array of unknown bound of T” can be converted to an rvalue of type “pointer to T.” The result is a pointer to the first element of the array." I am not sure how do we get an rvalue of an array type other than during initialization/declaration? ...
Consider the below. #include <string> using std::string; string middle_name () { return "Jaan"; } int main() { string&& danger = middle_name(); // ?! return 0; } This doesn't compute anything, but it compiles without error and demonstrates something that I find confusing: danger is a dangling reference, isn't it? ...
C++03 $14.1/6 - "A non-type non-reference template-parameter is not an lvalue." C++0x $14.2/6- "A non-type non-reference template-parameter is an rvalue." Is there any specific rationale behind rewording it? ...
What is the difference between: const double& pi = 3.14; and (no ampersand): const double pi = 3.14; They both seem to have the same L and R values so what is the difference? Thanks. ...
C++03 §4.2 N°1: An lvalue or rvalue of type “array of N T” or “array of unknown bound of T” can be converted to an rvalue of type “pointer to T.” The result is a pointer to the first element of the array. What has been confusing in this statement for a long time for me was that I didn't quite understand what an rvalue of array type woul...