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What does “program to interfaces, not implementations” mean?
...
Interfaces are just contracts or signatures and they don't know
anything about implementations.
Coding against interface means, the client code always holds an Interface object which is supplied by a factory. Any instance returned by the factory would be of type In...
Why is sizeof considered an operator?
Why is sizeof considered an operator and not a function?
10 Answers
10
...
What are “first class” objects?
...r something else said to be "first class" in a given programming language, and why? In what do they differ from languages where they are not?
...
What is a stored procedure?
What is a "stored procedure" and how do they work?
17 Answers
17
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How to get month name from Calendar
... Mickey to answer your question, here is how you get month as int and use it - public static void main(String[] args) { int month; GregorianCalendar date = new GregorianCalendar(); month = date.get(Calendar.MONTH); System.out.println("Current month is " + (month + 1) + " and Mont...
Why does ~True result in -2?
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int(True) is 1.
1 is:
00000001
and ~1 is:
11111110
Which is -2 in Two's complement1
1 Flip all the bits, add 1 to the resulting number and interpret the result as a binary representation of the magnitude and add a negative sign (since the number begins...
php中json_decode()和json_encode()的使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
..., true));
?>
上例将输出：
object(stdClass)#1 (5) {
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => int(5)
}
array(5) {
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => int(5)
}
$data='[
{"Name":"a1","Num...
Exact time measurement for performance testing [duplicate]
...d Mar 24 '13 at 11:05
Ivaylo Strandjev
62.1k1313 gold badges104104 silver badges159159 bronze badges
answered Jun 9 '09 at 10:40
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How to remove all the occurrences of a char in c++ string
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Basically, replace replaces a character with another and '' is not a character. What you're looking for is erase.
See this question which answers the same problem. In your case:
#include <algorithm>
str.erase(std::remove(str.begin(), str.end(), 'a'), str.end());
Or us...
Most efficient method to groupby on an array of objects
... })
};
});
};
group.register = function(name, converter) {
return group[name] = function(data, names) {
return _.map(group(data, names), converter);
};
};
return group;
}());
DataGrouper.register("sum", function(item) {
return _....