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Compare double to zero using epsilon
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Assuming 64-bit IEEE double, there is a 52-bit mantissa and 11-bit exponent. Let's break it to bits:
1.0000 00000000 00000000 00000000 00000000 00000000 00000000 × 2^0 = 1
The smallest representable number greater than 1:
1.0000 00000000 00000000 00000000 00000000 00000000 00000001 × 2^0 ...
How does virtual inheritance solve the “diamond” (multiple inheritance) ambiguity?
...pe D would have 2 vtable pointers (you can see them in the first diagram), one for B and one for C who virtually inherit A. D's object size is increased because it stores 2 pointers now; however there is only one A now.
So B::A and C::A are the same and so there can be no ambiguous calls from D....
How to sparsely checkout only one single file from a git repository?
How do I checkout just one file from a git repo?
21 Answers
21
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Difference between `set`, `setq`, and `setf` in Common Lisp?
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Originally, in Lisp, there were no lexical variables -- only dynamic ones. And
there was no SETQ or SETF, just the SET function.
What is now written as:
(setf (symbol-value '*foo*) 42)
was written as:
(set (quote *foo*) 42)
which was eventually abbreviavated to SETQ (SET Quoted):
(setq...
Android; Check if file exists without creating a new one
...heck if file exists in my package folder, but I don't want to create a new one.
7 Answers
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Why is it not possible to extend annotations in Java?
...Q, where it says:
Why don’t you support annotation subtyping (where one annotation type extends another)?
It complicates the annotation type
system, and makes it much more
difficult to write “Specific Tools”.
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“Specific Tools” — Programs that query
known anno...
Is there a way to loop through a table variable in TSQL without using a cursor?
...ch every single row in the table, the EXISTS only needs to touch the first one (see Josef's answer below).
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Git: Merge a Remote branch locally
... the remote branch:
git fetch origin aRemoteBranch
If you want to merge one of those remote branches on your local branch:
git checkout master
git merge origin/aRemoteBranch
Note 1: For a large repo with a long history, you will want to add the --depth=1 option when you use git fetch.
Note 2:...
Two arrays in foreach loop
I want to generate a selectbox using two arrays, one containing the country codes and another containing the country names.
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Is APC compatible with PHP 5.4 or PHP 5.5?
... Neither is perfect, but it is close enough for the majority of sites.
Anyone with C / gdb skills and some free time is urged to gloss over the bug list and see if they can fix anything, or improve this free open source product that we all rely on.
Alternative solutions exist, Wikipedia provides a ...