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node and Error: EMFILE, too many open files
...gonna fix your wagon if your issue is with sockets.)
From My Blog Article: http://www.blakerobertson.com/devlog/2014/1/11/how-to-determine-whats-causing-error-connect-emfile-nodejs.html
How To Isolate
This command will output the number of open handles for nodejs processes:
lsof -i -n -P | grep node...
dynamic_cast and static_cast in C++
...undown, it does not cover all the intricacies.
static_cast< Type* >(ptr)
This takes the pointer in ptr and tries to safely cast it to a pointer of type Type*. This cast is done at compile time. It will only perform the cast if the type types are related. If the types are not related, you ...
C++ lambda with captures as a function pointer
... which you captured.
template<typename Tret, typename T>
Tret lambda_ptr_exec(T* v) {
return (Tret) (*v)();
}
template<typename Tret = void, typename Tfp = Tret(*)(void*), typename T>
Tfp lambda_ptr(T& v) {
return (Tfp) lambda_ptr_exec<Tret, T>;
}
Example
int a = 100;...
Quick Way to Implement Dictionary in C
... int i;
for(i=0;iname = (char *) malloc (strlen(key_name)+1);
ptr->val = sval;
strcpy (ptr->name,key_name);
ptr->next = (struct dict *)table[hsh];
table[hsh] = ptr;
}
int getval ( char *key_name )
{
int hsh = hash(key_name);
dict *ptr;
for (pt...
How can I propagate exceptions between threads?
...
C++11 introduced the exception_ptr type that allows to transport exceptions between threads:
#include<iostream>
#include<thread>
#include<exception>
#include<stdexcept>
static std::exception_ptr teptr = nullptr;
void f()
{
tr...
port forwarding in windows
...
nginx is useful for forwarding HTTP on many platforms including Windows. It's easy to setup and extend with more advanced configuration. A basic configuration could look something like this:
events {}
http {
server {
listen 192.168.1.111:44...
memcpy() vs memmove()
...webarchive link from Pascal Cuoq above: web.archive.org/web/20130722203254/http://…
– JWCS
May 29 at 16:43
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Reason to Pass a Pointer by Reference in C++?
...ename T>
void moronic_delete(T*& p)
{
delete p;
p = nullptr;
}
Without the reference, you would only be changing a local copy of the pointer, not affecting the caller.
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i...
Do HTML WebSockets maintain an open connection for each client? Does this scale?
...ange those clients into WebSockets clients and it just might be feasible.
HTTP connections, while they don't create open files or consume port numbers for a long period, are more expensive in just about every other way:
Each HTTP connection carries a lot of baggage that isn't used most of the tim...
C++ equivalent of java's instanceof
...{
return dynamic_cast<const Base*>(ptr) != nullptr;
}
Example: http://cpp.sh/6qir
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