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What does T&& (double ampersand) mean in C++11?
...ly converted to rvalue references using the std::move function (it just performs the conversion). The following code both invoke the move constructor for f1 and f2:
foo f1((foo())); // Move a temporary into f1; temporary becomes "empty"
foo f2 = std::move(f1); // Move f1 into f2; f1 is now "empty"...
Renaming table in rails
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You can also use the new form for migrations with the 'change' method instead of up & down. example
– MegaTux
Dec 6 '11 at 15:41
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Why sizeof int is wrong, while sizeof(int) is right?
... expression. The ambiguity would be resolved but sizeof int() would be ill-formed ("no operator() for size_t"), which I expect would be unwelcome!
– Steve Jessop
Oct 30 '12 at 12:12
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What are commit-ish and tree-ish in Git?
..." or "English". The usage you describe makes less sense to me because that form of "ish" creates an adjective. But the rev isn't "like" a tree or commit, it is a tree or commit. On the other hand if you think of "ish" as a language suffix then they make more sense as nouns on the command line, where...
Parse a .py file, read the AST, modify it, then write back the modified source code
...e project may meet your needs if you want to do more refactoring like transforms.
The ast module is your other option, and there's an older example of how to "unparse" syntax trees back into code (using the parser module). But the ast module is more useful when doing an AST transform on code that i...
Which is better, number(x) or parseFloat(x)?
... to a number, in which case parseFloat is helpful because styles come in a form like '3px', in which case I want to drop the 'px' part and just get the 3, so I find parseFloat helpful here. But really which one you choose is up to you and which forms of input you want to accept.
Note that using the...
Proper package naming for testing with the Go language
... or package myfunc_test in the test file depends on whether you want to perform white-box or black-box testing.
There's nothing wrong with using both methods in a project. For instance, you could have myfunc_whitebox_test.go and myfunx_blackbox_test.go.
Test Code Package Comparison
Black-box Te...
Multiline bash commands in makefile
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You can include comments by using the following form: command ; ## my comment \` (the comment is between ;` and `\`). This seems to work fine except that if you run the command manually (by copy-and-paste), the command history will include the comment in a way that breaks...
Open a URL in a new tab (and not a new window)
...g name for the new window. The name can be used as the target of links and forms using the target attribute of an <a> or <form> element. The name should not contain any whitespace characters. Note that strWindowName does not specify the title of the new window.
– hy...
What are the basic rules and idioms for operator overloading?
...on below on Binary Arithmetic Operators. For implementing your own custom format and parsing logic when your object is used with iostreams, continue.
The stream operators, among the most commonly overloaded operators, are binary infix operators for which the syntax specifies no restriction on whet...