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Constants in Objective-C
...ll not be used in mixed C/C++ environments or on other platforms)
You can include this file in each file that uses the constants or in the pre-compiled header for the project.
You define these constants in a .m file like
// Constants.m
NSString *const MyFirstConstant = @"FirstConstant";
NSString...
How do I clear the std::queue efficiently?
...Yes - a bit of a misfeature of the queue class, IMHO. This is what I do:
#include <queue>
using namespace std;;
int main() {
queue <int> q1;
// stuff
q1 = queue<int>();
}
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How to install GCC piece by piece with GMP, MPFR, MPC, ELF, without shared libraries?
...d process, and they need to remove that first:
unset LIBRARY_PATH CPATH C_INCLUDE_PATH PKG_CONFIG_PATH CPLUS_INCLUDE_PATH INCLUDE LD_LIBRARY_PATH
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Creating a new directory in C
...for checking if the directory exists,
And mkdir, to create a directory.
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
struct stat st = {0};
if (stat("/some/directory", &st) == -1) {
mkdir("/some/directory", 0700);
}
You can see the manual of these f...
How to get current timestamp in milliseconds since 1970 just the way Java gets
.... You can use it to get the milliseconds since the Unix Epoch like this:
#include <chrono>
// ...
using namespace std::chrono;
milliseconds ms = duration_cast< milliseconds >(
system_clock::now().time_since_epoch()
);
...
Random Gaussian Variables
...st an answer.
I've made some extension methods for the .NET Random class, including an implementation of the Box-Muller transform. Since they're extensions, so long as the project is included (or you reference the compiled DLL), you can still do
var r = new Random();
var x = r.NextGaussian();
Ho...
新浪是如何分析处理32亿条实时日志的？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...段时间，我们都在应对JVM Heap High Usage，他带了的问题是Old GC次数多，时间长，es节点频繁退出集群，整个集群几乎停止响应。现在我们的主要策略是开启doc_values；限制query执行时占用的JVM Heap size；analyzed string只允许做query，不允...
How can I get a view's current width and height when using autolayout constraints?
...
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What does extern inline do?
...enthusiasticgeek (LOGGING example for StackOverflow)
#ifdef __cplusplus
#include <cstdio>
#include <cstring>
#else
#include <stdio.h>
#include <string.h>
#endif
//=========== MACRO MAGIC BEGINS ============
//Trim full file path
#define __SFILE__ (strrchr(__FILE__,'/')...