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Is sizeof(bool) defined in the C++ language standard?
...sizeof(char), sizeof(signed char) and sizeof(unsigned char) are 1; the result of sizeof applied to any other fundamental type is implementation-defined. [Note: in particular, sizeof(bool) and sizeof(wchar_t) are implementation-defined.69)]
Footnote 69):
sizeof(bool) is not required to be 1.
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git push says “everything up-to-date” even though I have local changes
...et your branch head to your previously detached commit
$ git reset --hard <commit-id>
As mentioned in the git checkout man page (emphasis mine):
It is sometimes useful to be able to checkout a commit that is not at the tip of one of your branches.
The most obvious example is to check...
Replace one character with another in Bash
... time complexity is worse than linear. A small test: x="$(tr -dc 'a-z \n' </dev/urandom | head -c1M)"; time y="$(tr ' ' \\- <<< "$x")"; time z="${x// /-}". With a string length of 1M (=2^20) tr took 0.04s and bash 5.0.11 took 17s. With 2M tr took 0.07s (expected) but bash took 69s (4 ti...
What are the “loose objects” that the Git GUI refers to?
...s that are not needed and few weeks old are also removed and with --prune=<date> option you can force remove loose objects that are no longer needed. Like when you amend a commit. The old commit object is no longer needed. )
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uint8_t vs unsigned char
...r, whereas in the context of a UTF8 string, it may be just one byte of a multibyte character. Using uint8_t could make it clear that one shouldn't expect a character at every position -- in other words that each element of the string/array is an arbitrary integer that one shouldn't make any semantic...
How can I truncate a datetime in SQL Server?
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CONVERT(DATE, <yourdatetime>) or CONVERT(DATE, GetDate()) or CONVERT(DATE, CURRENT_TIMESTAMP)
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How to get and set the current web page scroll position?
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You're looking for the document.documentElement.scrollTop property.
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What is Prism for WPF?
... locator support, which helps if you want to use DI/shared services for VM<->VM communication. It doesn't have some of the "extra" stuff provided by some MVVM "frameworks", such as a messaging framework, etc.
– Reed Copsey
Jun 9 '11 at 17:27
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Rails filtering array of objects by attribute value
...e :
@logos , @images = [], []
@attachments.each do |attachment|
@logos << attachment if attachment.file_type == 'logo'
@images << attachment if attachment.file_type == 'image'
end
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SET NOCOUNT ON usage
...network packet so no roundtrips are wasted.
I think you can stick to default counting behavior almost always without worrying about the performance. There are some cases though, where calculating the number of rows beforehand would impact the performance, such as a forward-only cursor. In that case...