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What is 'Pattern Matching' in functional languages?
...
head :: List a -> a
-- An empty list has no first item, so we raise an error.
head Nil = error "empty list"
-- If we are given a `Cons`, we only want the first part; that's the list's head.
head (Cons h _) = h
Since List a values can be of two different kinds, we need to handle each one...
Extract a regular expression match
...,perl=TRUE)
[1] "12"
Trying to substitute out non-digits will lead to an error in this case.
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How do I pass a unique_ptr argument to a constructor or a function?
...ts (the order of evaluation being unspecified), which could lead to subtle errors; by contrast, using mode 3 assures that no move from p takes place before the function call, so other arguments can safely access a value through p.
When used with std::shared_ptr, this mode is interesting in that wit...
ZeroMQ实例-使用ZMQ(ZeroMQ)进行局域网内网络通信 - C/C++ - 清泛网 - 专注C/C++及内核技术
...息时，
//zmq_recv函数返回错误信息 ，并使用zmq_strerror函数进行错误定位
if(zmq_recv(pSock, szMsg, sizeof(szMsg), 0) < 0)
{
printf("error = %s\n", zmq_strerror(errno));
continue;
}
printf("received message :...
How to remove first 10 characters from a string?
...-10)
you will need to perform the length checks else this would throw an error
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How can I add reflection to a C++ application?
... Note that if you try to compile this under Visual Studio you will get an error because VS doesn't handle the variadic macro expansion properly. For VS, try adding: #define DETAIL_TYPEOF_INT2(tuple) DETAIL_TYPEOF_HEAD tuple and #define DETAIL_TYPEOF_INT(...) DETAIL_TYPEOF_INT2((__VA_ARGS__))...
Class JavaLaunchHelper is implemented in both. One of the two will be used. Which one is undefined [
...eady suspected -- the JDK is still broken.
The bug report claims that the error is benign and should not cause any run-time problems, though one of the comments disagrees with that. In my own experience, I have been able to work without any problems using JDK 1.7.0_60 despite seeing the message.
I...
Grouping functions (tapply, by, aggregate) and the *apply family
...so you will end up with either the exact expected output or an informative error. On the other hand, sapply will try to simplify the output following rules that aren't always obvious, and fall back to a list otherwise. For instance, try to predict the type of output this will produce: sapply(list(1:...
Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
}
catch
{
return "ERROR IN QUOTE.";
}
//Make sure that the timer is started.
if (!tmrTimer.Enabled)
{
tmrTimer.Start();
}
for (int i = 0; i < ma...
How can I add the sqlite3 module to Python?
... if your python3 is built from source manually , and meet this error, you should install sqlite-devel package first, then rebuild python3.
– ngn999
Mar 28 '16 at 1:28
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