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GCC dump preprocessor defines
Is there a way for gcc/g++ to dump its preprocessor defines from the command line?
I mean things like __GNUC__ , __STDC__ , and so on.
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How to convert QString to std::string?
...the constructor of the STL string" is not correct statement: Quoting the standard: 12.2.3 Temporary objects are destroyed as the last step in evaluating the full-expression (1.9) that (lexically) contains the point where they were created. And the full expression there is std::string utf8_text = qs....
Rotated elements in CSS that affect their parent's height correctly
...kes undefined behaviour according to the CSS 2 spec - so while I've tested and confirmed that it works in Chrome, Firefox, Safari, and Edge, I can't promise you that it won't break in a future browser release.
Short answer
Given HTML like this, where you want to rotate .element-to-rotate...
<d...
Check if a variable is a string in JavaScript
... in the case of strings created with new String(), but this is seldom used and recommended against[1][2]. See the other answers for how to handle these, if you so desire.
The Google JavaScript Style Guide says to never use primitive object wrappers.
Douglas Crockford recommended that primitive o...
Why is it Valid to Concatenate Null Strings but not to Call “null.ToString()”?
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The binary + operator performs string concatenation when one or both operands are of type string.
If an operand of string concatenation is null, an empty string is substituted. Otherwise, any non-string argument is converted to its string representation by invoking the virtual ToString method inhe...
Circular (or cyclic) imports in Python
... pretty straightforward really. Just remember the following:
'import' and 'from xxx import yyy' are executable statements. They execute
when the running program reaches that line.
If a module is not in sys.modules, then an import creates the new module
entry in sys.modules and then exe...
How do I create directory if it doesn't exist to create a file?
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Elegant solution as it handles situations that require creation of nested folders.
– Denny Jacob
May 8 '17 at 20:57
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How to check if a table contains an element in Lua?
...r function is as efficient as can be done. Of course, as noted by others (and as practiced in languages older than Lua), the solution to your real problem is to change representation. When you have tables and you want sets, you turn tables into sets by using the set element as the key and true as ...
Is there a link to the “latest” jQuery library on Google APIs? [duplicate]
...t.min.js"></script>
However, since jQuery 1.11.1, both jQuery and Google stopped updating these URL's; they will forever be fixed at 1.11.1. There is no supported alternative URL to use. For an explanation of why this is the case, see this blog post; Don't use jquery-latest.js.
Both ho...
Why is sed not recognizing \t as a tab?
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Not all versions of sed understand \t. Just insert a literal tab instead (press Ctrl-V then Tab).
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