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Update MongoDB field using value of another field
In MongoDB, is it possible to update the value of a field using the value from another field? The equivalent SQL would be something like:
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What is stack unwinding?
What is stack unwinding? Searched through but couldn't find enlightening answer!
11 Answers
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Python's json module, converts int dictionary keys to strings
I have found that when the following is run, python's json module (included since 2.6) converts int dictionary keys to strings.
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Why are C# 3.0 object initializer constructor parentheses optional?
It seems that the C# 3.0 object initializer syntax allows one to exclude the open/close pair of parentheses in the constructor when there is a parameterless constructor existing. Example:
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How to refer environment variable in POM.xml?
I am using maven as build tool. I have set an environment variable called env . How can I get access to this environment variable's value in the pom.xml file?
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Color in git-log
When you run git log --decorate --pretty=oneline the output will have entries like (HEAD, refs/published/master, master) with coloration.
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How should I detect unnecessary #include files in a large C++ project?
I am working on a large C++ project in Visual Studio 2008, and there are a lot of files with unnecessary #include directives. Sometimes the #include s are just artifacts and everything will compile fine with them removed, and in other cases classes could be forward declared and the #include could...
How do I execute any command editing its file (argument) “in place” using bash?
I have a file temp.txt, that I want to sort with the sort command in bash.
14 Answers
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When and why will a compiler initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?
I know that the compiler will sometimes initialize memory with certain patterns such as 0xCD and 0xDD . What I want to know is when and why this happens.
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How to create the branch from specific commit in different branch
I have made several commits in the master branch and then merged them to dev branch.
5 Answers
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