It allows the differentiation of bitwise const and logical const. Logical const is when an object doesn’t change in a way that is visible through the public interface, like your locking example. Another example would be a class that computes a value the first time it is requested, and caches the result. Since c++11 mutable … Read more
Just as a brief answer, there are two usages for the static keyword when defining variables: 1- Variables defined in the file scope with static keyword, i.e. defined outside functions will be visible only within that file. Any attempt to access them from other files will result in unresolved symbol at link time. 2- Variables … Read more
sum.up is not a valid keyword argument name. Keyword arguments must be valid identifiers. You should look in the documentation of the library you are using how this argument really is called – maybe sum_up?
if(!(child is IContainer)) is the only operator to go (there’s no IsNot operator). You can build an extension method that does it: public static bool IsA<T>(this object obj) { return obj is T; } and then use it to: if (!child.IsA<IContainer>()) And you could follow on your theme: public static bool IsNotAFreaking<T>(this object obj) { … Read more
Change public class Event { public int event { get; set; } public EventDetail data { get; set; } } to this public class Event { public int @event { get; set; } public EventDetail data { get; set; } } This tip shows the quirks involved with escaping in C#: character literal escaping: e.g. … Read more
use backtick to escape keyword instead. just like how you created your table. using double quote or single quote will parse it into string that is why you’re getting two records of and select `AND` from test;
You can escape with backticks: val `type` = 5
Instead of using regexes you could just (for example) separate your string with str.partition(separator) like this: mystring = “hi my name is ryan, and i am new to python and would like to learn more” keyword = ‘name’ before_keyword, keyword, after_keyword = mystring.partition(keyword) >>> before_keyword ‘hi my ‘ >>> keyword ‘name’ >>> after_keyword ‘ is … Read more
Basically you only really need it when you want to use two types with the same fully qualified name (same namespace, same type name) from different assemblies. You declare a different alias for each assembly, so you can then reference them via that alias. Needless to say, you should try to avoid getting into that … Read more
GO is like the end of a script. You could have multiple CREATE TABLE statements, separated by GO. It’s a way of isolating one part of the script from another, but submitting it all in one block. BEGIN and END are just like { and } in C/++/#, Java, etc. They bound a logical block … Read more