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C++ Dynamic Shared Library on Linux
...virtual otherwise linker will try to perform static linkage */
virtual void DoSomething();
private:
int x;
};
#endif
myclass.cc
#include "myclass.h"
#include <iostream>
using namespace std;
extern "C" MyClass* create_object()
{
return new MyClass;
}
extern "C" void destroy_object...
std::vector performance regression when enabling C++11
...me optimization (I also pass the -flto flag to gcc 4.7.2), the results are identical:
(I am compiling your original code, with container.push_back(Item());)
$ g++ -std=c++11 -O3 -flto regr.cpp && perf stat -r 10 ./a.out
Performance counter stats for './a.out' (10 runs):
35.426...
Java 8 Streams: multiple filters vs. complex condition
...le filter invocation using a lambda expression with &&.
But, as said, this kind of overhead will be eliminated by the HotSpot optimizer and is negligible.
In theory, two filters could be easier parallelized than a single filter but that’s only relevant for rather computational intense ta...
ByteBuffer.allocate() vs. ByteBuffer.allocateDirect()
...at any
time. Arrays are objects in Java, and
the way data is stored inside that
object could vary from one JVM
implementation to another.
For this reason, the notion of a
direct buffer was introduced. Direct
buffers are intended for interaction
with channels and native I/O routine...
What is uint_fast32_t and why should it be used instead of the regular int and uint32_t?
...anteed to exist. It's an optional typedef that the implementation must provide iff it has an unsigned integer type of exactly 32-bits. Some have a 9-bit bytes for example, so they don't have a uint32_t.
uint_fast32_t states your intent clearly: it's a type of at least 32 bits which is the best from ...
Why does Unicorn need to be deployed together with Nginx?
...ing Unicorn without a reverse proxy. However, that wouldn't be a very good idea; let's see why.
Unicorn follows the Unix philosophy which is to do one thing and do it well, and that is to serve fast, low-latency clients (we'll see what this means later on). The fact that Unicorn is designed for fas...
How does type Dynamic work and how to use it?
...cs
or set the compiler option -language:dynamics because the feature is hidden by default.
selectDynamic
selectDynamic is the easiest one to implement. The compiler translates a call of foo.bar to foo.selectDynamic("bar"), thus it is required that this method has an argument list expecting a Str...
Very simple log4j2 XML configuration file using Console and File appender
...)
Use Logger logger = LogManager.getLogger(); to initialize your logger
I did set the immediateFlush="false" since this is better for SSD lifetime. If you need the log right away in your log-file remove the parameter or set it to true
...
Equation (expression) parser with precedence?
... code like say, Aperture with GCC and they sell it without having to GPL said code).
Download Bison (or something equivalent, ANTLR, etc.).
There is usually some sample code that you can just run bison on and get your desired C code that demonstrates this four function calculator:
http://www.gnu....
How Python web frameworks, WSGI and CGI fit together
...POST-oriented input as a file-like object in the environment. It also provides you a function that will formulate the response, saving you from a lot of formatting details.
What do I need to know / install / do if I want to run a web framework (say web.py or cherrypy) on my basic CGI configuration...