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What is the purpose of a question mark after a type (for example: int? myVariable)?
... allowed. return value ? value : "isNull"; tells me that string value isnt convertable into bool.
– C4d
Sep 7 '15 at 13:20
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Qt c++ aggregate 'std::stringstream ss' has incomplete type and cannot be defined
I have this function in my program that converts integers to strings:
2 Answers
2
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总结const_cast、static_cast、dynamic_cast、reinterpret_cast - C/C++ - ...
...t z;
};情况1：两个无关的类之间的转换
// Convert between CBaseX* and CBaseY*
// CBaseX* 和 CBaseY*之间的转换
CBaseX* pX = new CBaseX();
// Error, types pointed to are unrelated
// 错误， 类型指向是无关的
// CBaseY*...
DTO = ViewModel?
...posted to those methods and with some MVC magic, the data is automatically converted to DTOs before being passed to the methods. Do you think it is wrong to use DTOs in this case. Should ViewModels be used with a Web API? I am asking to better understand, because I am still not all that familiar wit...
In Python, what happens when you import inside of a function? [duplicate]
...de or outside a function), goo.py (or other importable form) is loaded and sys.modules['goo'] is set to the module object thus built. Any future import within the same run of the program (again, whether inside or outside a function) just look up sys.modules['goo'] and bind it to barename goo in the...
How to get the first and last date of the current year?
...from the current date obtained using getUTCDate()
SELECT
'01/01/' + CONVERT(VARCHAR(4), DATEPART(yy, getUTCDate())),
'31/12/' + CONVERT(VARCHAR(4), DATEPART(yy, getUTCDate()))
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i...
Bash Script: count unique lines in file
...me sort random.txt | uniq | wc -l
31175
real 0m1.193s
user 0m0.701s
sys 0m0.388s
$ time awk '!seen[$0]++' random.txt | wc -l
31175
real 0m0.675s
user 0m0.108s
sys 0m0.171s
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PHP - Get bool to echo false when false
...'ve been programming for 20+ years and never have I wanted 'false' to auto-convert to blank.. null many times, but never 'false'. My Java/Spring/Hibernate development is so so so much cleaner & stronger than even modest PHP systems. I could find plenty of people who were confused.. stackoverflow...
How come an array's address is equal to its value in C?
...er than the first (because it's an array of 16 char's). Since %p typically converts pointers in hexadecimal, it might look something like:
0x12341000 0x12341010
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Can I list-initialize a vector of move-only type?
...ove_only()) };
Since the standard, for whatever reason, doesn't define a converting copy constructor like this:
// in class initializer_list
template<class U>
initializer_list(initializer_list<U> const& other);
The initializer_list<rref_wrapper<move_only>> created by...