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Find first element by predicate
...ly do the following test:
List<Integer> list = Arrays.asList(1, 10, 3, 7, 5);
int a = list.stream()
.peek(num -> System.out.println("will filter " + num))
.filter(x -> x > 5)
.findFirst()
.get();
System.out.println(a);
Which outputs:
...
What would be C++ limitations compared C language? [closed]
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32 Answers
32
Active
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How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
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6173
How can I merge two Python dictionaries in a single expression?
For dictionaries x and y, z be...
Can we have functions inside functions in C++?
...1 to i
std::cout << i << "\n";
}
}
C++98 and C++03 - Not directly, but yes with static functions inside local classes
C++ doesn't support that directly.
That said, you can have local classes, and they can have functions (non-static or static), so you can get this to some...
tcp端口状态ESTABLISHED、TIME_WAIT、CLOSE_WAIT 、SYN_RECV等详解 - C/C++...
...
ESTABLISHED的意思是建立连接。表示两台机器正在通信。
3、CLOSE_WAIT
对方主动关闭连接或者网络异常导致连接中断，这时我方的状态会变成CLOSE_WAIT 此时我方要调用close()来使得连接正确关闭
4、TIME_WAIT
我方主动调用close()断开...
How can I get the current PowerShell executing file?
...s answers here, updated for PowerShell 5:
If you're only using PowerShell 3 or higher, use $PSCommandPath
If want compatibility with older versions, insert the shim:
if ($PSCommandPath -eq $null) { function GetPSCommandPath() { return $MyInvocation.PSCommandPath; } $PSCommandPath = GetPSCommandPat...
Nested function in C
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James McNellisJames McNellis
319k7070 gold badges865865 silver badges944944 bronze badges
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Insert, on duplicate update in PostgreSQL?
... the_table (id, column_1, column_2)
VALUES (1, 'A', 'X'), (2, 'B', 'Y'), (3, 'C', 'Z')
ON CONFLICT (id) DO UPDATE
SET column_1 = excluded.column_1,
column_2 = excluded.column_2;
Searching postgresql's email group archives for "upsert" leads to finding an example of doing what you poss...
Why do we need C Unions?
... int i;
float f;
} u;
// Convert floating-point bits to integer:
u.f = 3.14159f;
printf("As integer: %08x\n", u.i);
Although this is technically undefined behavior according to the C standard (you're only supposed to read the field which was most recently written), it will act in a well-define...
Extracting .jar file with command line
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153
From the docs:
To extract the files from a jar file, use x, as in:
C:\Java> jar xf myFil...