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Why is list initialization (using curly braces) better than the alternatives?
...= val; // if val==7.9, x2 becomes 7 (bad)
char c2 = val2; // if val2==1025, c2 becomes 1 (bad)
int x3 {val}; // error: possible truncation (good)
char c3 {val2}; // error: possible narrowing (good)
char c4 {24}; // OK: 24 can be represented exactly as a char (good)
char c5 {...
Why do we need extern “C”{ #include } in C++?
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11 Answers
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Why is @autoreleasepool still needed with ARC?
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216
ARC doesn't get rid of retains, releases and autoreleases, it just adds in the required ones fo...
@import vs #import - iOS 7
...ature called Modules or "semantic import". There's more info in the WWDC 2013 videos for Session 205 and 404. It's kind of a better implementation of the pre-compiled headers. You can use modules with any of the system frameworks in iOS 7 and Mavericks. Modules are a packaging together of the framew...
Why do people use Heroku when AWS is present? What distinguishes Heroku from AWS? [closed]
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Unpacking a list / tuple of pairs into two lists / tuples [duplicate]
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>>> source_list = ('1','a'),('2','b'),('3','c'),('4','d')
>>> list1, list2 = zip(*source_list)
>>> list1
('1', '2', '3', '4')
>>> list2
('a', 'b', 'c', 'd')
Edit: Note that zip(*iterable) is its own inverse:
>>...
Using a string variable as a variable name [duplicate]
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215
You can use exec for that:
>>> foo = "bar"
>>> exec(foo + " = 'something els...
jQuery - replace all instances of a character in a string [duplicate]
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answered Nov 26 '12 at 23:31
GuffaGuffa
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Linux Shell中 if else及大于、小于、等于逻辑表达式写法 - C/C++ - 清泛网...
...文件大小非0时为真
-t file 当文件描述符(默认为1)指定的设备为终端时为真
含条件选择的shell脚本 对于不含变量的任务简单shell脚本一般能胜任。但在执行一些决策任务时，就需要包含if/then的条件判断了。shell脚本编程...