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Purpose of Unions in C and C++
...ype punning (i.e. writing one member and then reading another) was given a more detailed definition in one of the Technical Corrigenda to the C99 standard (see DR#257 and DR#283). However, keep in mind that formally this does not protect you from running into undefined behavior by attempting to read...
multiple definition of template specialization when using different objects
... fully specialize something, it doesn't depend on a template parameter any more -- so unless you make the specialization inline, you need to put it in a .cpp file instead of a .h or you end up violating the one definition rule as David says. Note that when you partially specialize templates, the par...
What is the difference between is_a and instanceof?
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One more thing to note about is_a vs the instanceof operator is that is_a will accept expressions for the second parameter, while instanceof wont. For example is_a($object, 'Prefix_'.$name) works while $object instanceof 'Prefix_...
How bad is shadowing names defined in outer scopes?
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No big deal in your above snippet, but imagine a function with a few more arguments and quite a few more lines of code. Then you decide to rename your data argument as yadda but miss one of the places it is used in the function's body... Now data refers to the global, and you start having weir...
Linux command to print directory structure in the form of a tree
... Note for any visitor seeing this: The man page lists a truckload of more flags for you :)
– oivvio
Apr 26 '14 at 18:52
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Git - working on wrong branch - how to copy changes to existing topic branch
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Get name of currently executing test in JUnit 4
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There are more efficient ways of doing this available.
– Duncan Jones
Dec 21 '12 at 9:57
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Git undo changes in some files [duplicate]
...uires the use of the rebase -i command. This one can be useful if you have more than one commit to edit:
# use rebase -i to cherry pick the commit you want to edit
# specify the sha1 of the commit before the one you want to edit
# you get an editor with a file and a bunch of lines starting with "pi...
HashMap and int as key
... automatically autobox your int primitive values to Integer objects.
Read more about autoboxing from Oracle Java documentations.
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Good ways to manage a changelog using git?
...le now, and I recently started using it to tag my releases so that I could more easily keep track of changes and be able to see which version each of our clients are running (unfortunately the code currently mandates that each client have their own copy of the PHP site; I'm changing this, but it's s...