I don’t think it will make a significant difference in compile time but #pragma once is very well supported across compilers but not actually part of the standard. The preprocessor may be a little faster with it as it is more simple to understand your exact intent. #pragma once is less prone to making mistakes … Read more
When do you use the “this” keyword? [closed]
Named tuples were added in 2.6 for this purpose. Also see os.stat for a similar builtin example. >>> import collections >>> Point = collections.namedtuple(‘Point’, [‘x’, ‘y’]) >>> p = Point(1, y=2) >>> p.x, p.y 1 2 >>> p[0], p[1] 1 2 In recent versions of Python 3 (3.6+, I think), the new typing library got … Read more
I often have several statements at the start of a method to return for “easy” situations. For example, this: public void DoStuff(Foo foo) { if (foo != null) { … } } … can be made more readable (IMHO) like this: public void DoStuff(Foo foo) { if (foo == null) return; … } So yes, … Read more
The varying line-ending characters don’t matter, assuming the file is open in text mode, which is what you get unless you ask for binary. The compiled program will write out the correct thing for the system compiled for. The only difference is that std::endl flushes the output buffer, and ‘\n’ doesn’t. If you don’t want … Read more
I’d like to take a moment to address the premise of your question – that eval() is “evil“. The word “evil“, as used by programming language people, usually means “dangerous”, or more precisely “able to cause lots of harm with a simple-looking command”. So, when is it OK to use something dangerous? When you know … Read more
They’re not recommended because it’s a PITA if you ever have to move your code to a server where it’s not supported (and you can’t enable it). As you say, lots of shared hosts do support shorttags but “lots” isn’t all of them. If you want to share your scripts, it’s best to use the … Read more