大约有 5,000 项符合查询结果（耗时：0.0175秒） [XML]
Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
... of an expression, the result is not mathematically defined or not in the range of
representable values for its type, the behavior is undefined. [ Note: most existing implementations of C++
ignore integer overflows. Treatment of division by zero, forming a remainder using a zero divisor, and ...
std::string to float or double
...throw exceptions: std::invalid_argument (if conversion failed) std::out_of_range (if out of the range)
– Jason Doucette
Feb 12 '15 at 23:21
...
String variable interpolation Java [duplicate]
...://en.wikipedia.org/wiki/Variable_interpolation
Edit As of 2019, JEP 326 (Raw String Literals) was withdrawn and superseeded by JEP 355 (Text Blocks). The latter tries to introduce "Text Blocks" into the language:
A text block is a multi-line string literal that avoids the need for
most escap...
Pretty graphs and charts in Python [closed]
...ting library from the folks at Enthought. It uses Enthought's Kiva vector drawing library and currently works only with Wx and Qt with OpenGL on the way (Matplotlib has backends for Tk, Qt, Wx, Cocoa, and many image types such as PDF, EPS, PNG, etc.). The main advantages of Chaco are its speed relat...
Decode Base64 data in Java
...
Almost good: this only accepts raw base64 streams, not base64 files. I had to use final byte[] decoded = Base64.getMimeDecoder().decode(encoded); instead. But thanks anyway! (Nice with commons-io FileUtils.readFileToByteArray and FileUtils.writeByteArrayTo...
Can I change the height of an image in CSS :before/:after pseudo-elements?
...ages/pdf.png');
transform: scale(.5);
}
http://jsfiddle.net/Nwupm/
Drawbacks: you need to know the intrinsic dimensions of the image, and it leaves you with some whitespace, which I can't get rid of ATM.
share
...
How to set DOM element as the first child?
... to append the fragment to a div . make your dom manipulation and then use Range.selectNodeContents() and Range.extractContents() to get back a fragment
– pery mimon
Feb 18 '18 at 23:17
...
Tool to generate JSON schema from JSON data [closed]
...
After several months, the best answer I have is my simple tool. It is raw but functional.
What I want is something similar to this. The JSON data can provide a skeleton for the JSON schema. I have not implemented it yet, but it should be possible to give an existing JSON schema as basis, so th...
Homebrew’s `git` not using completion
...tion working on OSX without having to restart your terminal:
curl https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash -o ~/.git-completion.bash && echo "source ~/.git-completion.bash" >> ~/.bash_profile && source ~/.bash_profile
...
Should I use 'has_key()' or 'in' on Python dicts?
...ed;-) but also in performance, e.g.:
$ python -mtimeit -s'd=dict.fromkeys(range(99))' '12 in d'
10000000 loops, best of 3: 0.0983 usec per loop
$ python -mtimeit -s'd=dict.fromkeys(range(99))' 'd.has_key(12)'
1000000 loops, best of 3: 0.21 usec per loop
While the following observation is not alwa...