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Why do we need extern “C”{ #include } in C++?
...thing like this: #ifdef __cplusplus extern "C" { #endif So when included from a C++ file they are still treated as a C header.
– Calmarius
Mar 13 '17 at 12:58
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...
Setting default values for columns in JPA
...ult value.
Note this will serve you if you're only accessing the database from this application. If other applications also use the database, then you should make this check from the database using Cameron's columnDefinition annotation attribute, or some other way.
...
Proper use of the HsOpenSSL API to implement a TLS Server
...eed to replace copySocket with two different functions, one to handle data from the plain socket to SSL and the other from SSL to the plain socket:
copyIn :: SSL.SSL -> Socket -> IO ()
copyIn src dst = go
where
go = do
buf <- SSL.read src 4096
unless (B.null buf)...
Java 8 Stream and operation on arrays
I have just discovered the new Java 8 stream capabilities. Coming from Python, I was wondering if there was now a neat way to do operations on arrays like summing, multiplying two arrays in a "one line pythonic" way ?
...
In C#, how do I calculate someone's age based on a DateTime type birthday?
... it, but if you format the date to yyyymmdd and subtract the date of birth from the current date then drop the last 4 digits you've got the age :)
I don't know C#, but I believe this will work in any language.
20080814 - 19800703 = 280111
Drop the last 4 digits = 28.
C# Code:
int now = int.Pa...
Is there a way to check if int is legal enum in C#?
...peof(MyEnum), value))
MyEnum a = (MyEnum)value;
This is the example from that page:
using System;
[Flags] public enum PetType
{
None = 0, Dog = 1, Cat = 2, Rodent = 4, Bird = 8, Reptile = 16, Other = 32
};
public class Example
{
public static void Main()
{
object value; ...
Cost of len() function
...0000 loops, best of 3: 0.0713 usec per loop
Deque:
$ python -mtimeit -s"from collections import deque;d=deque(range(10));" "len(d)"
100000000 loops, best of 3: 0.0163 usec per loop
$ python -mtimeit -s"from collections import deque;d=deque(range(1000000));" "len(d)"
100000000 loops, best of 3: 0...
Futures vs. Promises
...o these two separate "interfaces" is to hide the "write/set" functionality from the "consumer/reader".
auto promise = std::promise<std::string>();
auto producer = std::thread([&]
{
promise.set_value("Hello World");
});
auto future = promise.get_future();
auto consumer = std::thread...
static constructors in C++? I need to initialize private static objects
...ing to have to do all that. One of the many "mistakes" C# and java learned from.
– Gordon Gustafson
Jul 28 '09 at 22:59
110
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How to get the name of a class without the package?
...pe is anonymous is "[]".
It is actually stripping the package information from the name, but this is hidden from you.
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