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Covariance and contravariance real world example

...iantly as a mammal hat… IHat<Mammal> mHat = rHat; // Compiler error // …because… mHat.hide(new Dolphin()); // Hide a dolphin in a rabbit hat?? // It also cannot be treated contravariantly as a cottontail hat… IHat<CottonTail> cHat = rHat; // Compiler error // …becau...
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Unable to evaluate expression because the code is optimized or a native frame is on top of the call

I am getting the error: 12 Answers 12 ...
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How to run a PowerShell script from a batch file

... @joey it worked thanks..but after running the bat file i got this error "Waring:column 'command' does not fit into the display and was removed" – Eka Oct 12 '13 at 16:31 ...
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How to fix: “UnicodeDecodeError: 'ascii' codec can't decode byte”

...s soon as possible in your code Fix your locale: How to solve UnicodeDecodeError in Python 3.6? Don't be tempted to use quick reload hacks Unicode Zen in Python 2.x - The Long Version Without seeing the source it's difficult to know the root cause, so I'll have to speak generally. UnicodeDecodeE...
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Encoding as Base64 in Java

... @Frank Decoding the bytes at once raise OutOfMemory error.Any idea process it in buffer – xyz Jul 1 '15 at 10:30 add a comment  |  ...
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How to import data from mongodb to pandas?

... This isnt good for huge records as this doesnot shows memory error, instread hangs the system for too big data. while pd.DataFrame(list(cursor)) shows memory error. – Amulya Acharya Jun 25 '19 at 3:45 ...
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How do you explicitly set a new property on `window` in TypeScript?

..... you can just type: window['MyNamespace'] and you wont get a compile error and it works the same as typing window.MyNamespace share | improve this answer | follow ...
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EF5: Cannot attach the file ‘{0}' as database '{1}'

...base and now I see my 2 contexts. When I delete from this view I get a new error : 'can not retrieve data access level for this database'. I was able to get around this by using the command prompt. – nVentimiglia Jun 7 '14 at 17:50 ...
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Converting string from snake_case to CamelCase in Ruby

...ant in context (and does need camelize). 'active_record'.constantize gives error, 'active_record'.camelize.constantize returns the constant ActiveRecord, 'active_record'.classify returns the string 'ActiveRecord'. And if you did 'no_class'.camelize.constantize you'd get error (no such constant NoCla...
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Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

I am getting the following error when I try to connect to mysql: 34 Answers 34 ...