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Why #define TRUE (1==1) in a C boolean macro instead of simply as 1?
...work nicely in the C++. foo(TRUE) will want the int overload.
Of course, C99 introduced bool, true, and false and these can be used in header files that work with C99 and with C.
However:
this practice of defining TRUE and FALSE as (0==0) and (1==0) predates C99.
there are still good reasons to ...
App Inventor 2 文本输入框怎么设置输入数子上下限！ - App应用开发 - 清...
...入框怎么设置输入数字上下限！例如设置下限为0.1 上限99 如果下限输入小于0自动改为0.1,输入大于99自动改为99, 在下限0.1 与上限99 之间能任意输入,怎么做?目前只能点计算按钮，事件中加判断，不合适提醒并改成边界值。下个 ...
Assign a variable inside a Block to a variable outside a Block
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Luke
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answered Jan 10 '14 at 7:15
Umesh SawantUmesh Sawa...
In Objective-C why should I check if self = [super init] is not nil?
... that if (self != nil) check is there, for proper operation of your class, 99.99% of the time you actually do need self to be non-nil.
Now, suppose, for whatever reason, [super init] did return nil, basically your check against nil is basically passing the buck up to the caller of your class, where...
64-bit version of Boost for 64-bit windows
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I've got the built binaries on my site:
http://boost.teeks99.com
Edit 2013-05-13: My builds are now available (starting from 1.53) directly from the sourceforge page.
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impro...
Get the last non-empty cell in a column in Google Sheets
...an use INDEX and MATCH functions like this:
=DAYS360(A2; INDEX(A:A; MATCH(99^99;A:A; 1)))
I think this is a little bit faster and easier.
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fol...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
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499
NOTE: All algorithms below are in C, but should be portable to your language of choice (just do...
pandas: filter rows of DataFrame with operator chaining
... A B C D
a 1 4 9 1
b 4 5 0 2
c 5 5 1 0
d 1 3 9 6
In [99]: df[(df.A == 1) & (df.D == 6)]
Out[99]:
A B C D
d 1 3 9 6
If you want to chain methods, you can add your own mask method and use that one.
In [90]: def mask(df, key, value):
....: return df[df[key]...
Getting the thread ID from a thread
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Wai Ha Lee
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answered Nov 5 '09 at 9:07
BlindyBlindy
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The $.param( ) inverse function in JavaScript / jQuery
...:'one',bb:'two'},[5,6]]}), // 6
'a[]=hi&a[]=2&a[3][]=7&a[3][]=99&a[]=13',// 7
'a[x]=hi&a[]=2&a[3][]=7&a[3][]=99&a[]=13'// 8
].map(function(v){return JSON.stringify(getargs(v));}).join('\n')
results in
{"a":2} // 1
{"x":{"y":[{"z...