Sorted:

Do I really have to worry about alignment when using placement new operator?-Collection of common programming errors

problem about computer-science-Collection of common programming errors

problem about racket-Collection of common programming errors

problem about sqlexception-Collection of common programming errors

undefined index for PHP-Collection of common programming errors

C++ Comparing Member Function Pointers-Collection of common programming errors

Questions about static_cast-Collection of common programming errors

Multiple File Upload with Paperclip error-Collection of common programming errors

Unknown column errors because of table alias-Collection of common programming errors

XML Inflater not seeing any of the views?-Collection of common programming errors