Django: ‘current_tags’ is not a valid tag library

I would suggest the following: (Most likely) You haven’t installed one of the dependencies of your tag library. Check the imports inside the current_tags.py module. Make sure the application that includes the tag library is registered in settings.py under INSTALLED_APPS. Make sure that you can successfully import the tag library. python manage.py shell >>> from … Read more

How can I portably call a C++ function that takes a char** on some platforms and a const char** on others?

If what you want is just to turn a blind eye to some const issues, then you can use a conversion which blurs the distinction, i.e. makes char** and const char** interoperable: template<class T> class sloppy {}; // convert between T** and const T** template<class T> class sloppy<T**> { T** t; public: sloppy(T** mt) : … Read more

Are the experimental features of modern C++ reliable for long-term projects?

Is it guaranteed that all compliant compilers have the same experimental features? No, experimental features are optional. Are experimental features prone to big changes that make them unreliable? Yes, the C++ committee might even decide to abandon a feature or in the process of standardization a defect might come up that would force a feature … Read more

What belongs in an educational tool to demonstrate the unwarranted assumptions people make in C/C++?

The order of evaluation of subexpressions, including the arguments of a function call and operands of operators (e.g., +, -, =, * , /), with the exception of: the binary logical operators (&& and ||), the ternary conditional operator (?:), and the comma operator (,) is Unspecified For example int Hello() { return printf(“Hello”); /* … Read more

How to measure time in milliseconds using ANSI C?

There is no ANSI C function that provides better than 1 second time resolution but the POSIX function gettimeofday provides microsecond resolution. The clock function only measures the amount of time that a process has spent executing and is not accurate on many systems. You can use this function like this: struct timeval tval_before, tval_after, … Read more

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