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How to wait for all goroutines to finish without using time.Sleep?
... the callback method (in the example below, just the name of the file is printed out).
5 Answers
...
SQL how to increase or decrease one for a int column in one command
...this. Since you did not specify a database, I will assume MySQL.
INSERT INTO table SET x=1, y=2 ON DUPLICATE KEY UPDATE x=x+1, y=y+2
REPLACE INTO table SET x=1, y=2
They both can handle your question. However, the first syntax allows for more flexibility to update the record rather than just r...
Can git automatically switch between spaces and tabs?
...
That way:
each time you checkout some files of your repo, spaces can be converted in tabs,
but when you check-in (and push and publish), those same files are stored back using only spaces.
You can declare this filter driver (named here 'tabspace') in the .git/info/attributes (for a filter appl...
What is the significance of initializing direction arrays below with given values when developing ch
... and shown what move each index of the arrays will make from the central point, X, at 2,2.)
.....
.536.
.1X0.
.724.
.....
The way it is set up, if you do ^1 (^ being bitwise XOR) on the index you get the opposite direction - 0 and 1 are opposites, 2 and 3 are opposites and so on. (Another way to ...
what is “strict mode” and how is it used?
...alue is not coerced to an object. A this value of null or undefined is not converted to the global object and primitive values are not converted to wrapper objects. The this value passed via a function call (including calls made using Function.prototype.apply and Function.prototype.call) do not coer...
How to assert greater than using JUnit Assert?
...tring is the message in case of failure; you can use that if you want to print that such-and-such wasn't greater than so-and-so.
You could also add hamcrest-all as a dependency to use matchers. See https://code.google.com/p/hamcrest/wiki/Tutorial:
import static org.hamcrest.MatcherAssert.assertTha...
How do I use a PriorityQueue?
...ward though.)
As has been said elsewhere: offer and add are just different interface method implementations. In the JDK source I've got, add calls offer. Although add and offer have potentially different behaviour in general due to the ability for offer to indicate that the value can't be added due ...
C++静态和多态，亦敌亦友 - C/C++ - 清泛网 - 专注C/C++及内核技术
... static void foo(void){ cout << "DerivedAgain::foo()"<< endl; }
} ;
int main(int argc, char** argv)
{
DerivedAgain da;
Base* pB = &da;
da.foo();
pB->foo();
return 0;
}
上述代码运行结果是什么？等等，你确定上述代码能通过编译？在笔...
What is the id( ) function used for?
...questions:
What is the number returned from the function?
It is "an integer (or long integer) which is guaranteed to be unique and constant for this object during its lifetime." (Python Standard Library - Built-in Functions) A unique number. Nothing more, and nothing less. Think of it as a so...
How to use the IEqualityComparer
...ue. Distinct relies on a good hash function to work efficiently because it internally builds a hash table.
When implementing interfaces of classes it is important to read the documentation, to know which contract you’re supposed to implement.1
In your code, the solution is to forward GetHashCode...