C++14 specifies initialization of objects created with new in [expr.new]/17 ([expr.new]/15 in C++11, and the note wasn’t a note but normative text back then): A new-expression that creates an object of type T initializes that object as follows: If the new-initializer is omitted, the object is default-initialized (8.5). [ Note: If no initialization is performed, … Read more
Items in a vector must be assignable (or, in more recent versions of the standard, movable). const objects aren’t assignable, so attempting to store them in a vector will fail (or at least can fail — the code is invalid, but a compiler is free to accept it anyway, if it so chooses, though most … Read more
The main model used today for exceptions (Itanium ABI, VC++ 64 bits) is the Zero-Cost model exceptions. The idea is that instead of losing time by setting up a guard and explicitly checking for the presence of exceptions everywhere, the compiler generates a side table that maps any point that may throw an exception (Program … Read more