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What is an undefined reference/unresolved external symbol error and how do I fix it?

...cuted. [SNIP] Each source character set member in a character literal or a string literal, as well as each escape sequence and universal-character-name in a character literal or a non-raw string literal, is converted to the corresponding member of the execution character set; [SNIP] Adjacent string ...
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TypeLoadException says 'no implementation', but it is implemented

...faceDef, add just one class, and build: public interface IInterface { string GetString(string key); //short GetShort(string key); } Create a second class library project: Implementation (with separate solution), copy InterfaceDef.dll into project directory and add as file reference, add ju...
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What's the difference between eval, exec, and compile?

... call last): File "<stdin>", line 1, in <module> File "<string>", line 1 a = 47 ^ SyntaxError: invalid syntax The compile in 'exec' mode compiles any number of statements into a bytecode that implicitly always returns None, whereas in 'eval' mode it compiles a sin...
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Remove all special characters, punctuation and spaces from string

I need to remove all special characters, punctuation and spaces from a string so that I only have letters and numbers. 16 A...
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Check OS version in Swift?

...0 or 11 using if: let floatVersion = (UIDevice.current.systemVersion as NSString).floatValue EDIT: Just found another way to achieve this: let iOS8 = floor(NSFoundationVersionNumber) > floor(NSFoundationVersionNumber_iOS_7_1) let iOS7 = floor(NSFoundationVersionNumber) <= floor(NSFoundatio...
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Best way to store password in database [closed]

...note that a common misconception is to simply add the same unique and long string to all passwords; while this is not horrible, it is best to add unique salts to every password. Read this for more. share | ...
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How to escape a JSON string to have it in a URL?

... encodeURIComponent(JSON.stringify(object_to_be_serialised)) share | improve this answer | follow | ...
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Javascript/DOM: How to remove all events of a DOM object?

... that we cannot // use node as Object keys, as they'd get coerced into a string _eventHandlers[event].push({ node: node, handler: handler, capture: capture }) node.addEventListener(event, handler, capture) } const removeAllListeners = (targetNode, event) => { // remove listeners from the...
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Get all object attributes in Python? [duplicate]

...looking for, but... attrs = dir(obj) will store the array of attributes as strings in attrs. Then to access them, you can always use getattr(obj, attrs[i]) to get the ith attribute in the attrs array. – Nick Merrill Jun 27 '14 at 1:57 ...
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When to use Comparable and Comparator

...he instances properties. EX: Person.id Some of the Predefined Classes like String, Wrapper classes, Date, Calendar has implemented Comparable interface. Comparator - java.util.Comparator: int compare(Object o1, Object o2) A comparator object is capable of comparing two different objects. The cl...