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std::string的截取字符串的方法 - C/C++ - 清泛网 - 专注C/C++及内核技术

....0.1:8888"); int index = ip.find_last_of(':'); //ip ip.substr(0, index).c_str(); //port ip.substr(index + 1).c_str(); int find_first_of(char c, int start = 0): 查找字符串中第1个出现的c,由位置start开始。 如果有匹配,则返回匹配位置;否则,返回-1.默认情...
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C语言程序判断一个浮点型的数是否为零 - C/C++ - 清泛网 - 专注C/C++及内核技术

C语言程序判断一个浮点型的数是否为零f > -1e-7 && f < 1e-7详细原理请参见:《浮点数在内存中的表示》。f > -1e-7 && f < 1e-7 详细原理请参见:《浮点数在内存中的表示》。浮点型 为零
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c语言字符串常量内容是否可以通过指针修改 - C/C++ - 清泛网 - 专注C/C++及内核技术

c语言字符串常量内容是否可以通过指针修改答案是:不行。尝试修改的话,运行时程序会崩溃。int main(){ char str1[40]="hello world!"; char *str1="hello world!"...答案是:不行。尝试修改的话,运行时程序会崩溃。 int main() { char str...
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/usr/include/c++/4.9/bits/stl_iterator_base_types.h:165:53: error: ‘i...

/usr/include/c++/4.9/bits/stl_iterator_base_types.h:165:53: error: ‘int’ is not a class, struct, or union type先看下面的代码(来自:SO):#include <iostream>#include <cmath>#include <vector>using namespace std;double distance(int a, in...先看下面的代码(来自: SO): #include <i...
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MFC 获取当前时间的几种方法总结 - C/C++ - 清泛网 - 专注C/C++及内核技术

MFC 获取当前时间的几种方法总结1.CTime类获取当前时间CTime curTime = CTime::GetCurrentTime();CString strCurTime;strCurTime.Format(_T("d d d d:d:d"), curTime...1.CTime类获取当前时间 CTime curTime = CTime::GetCurrentTime(); CString strCurTime; strCurTime.Format(_T("d/d/...
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ifstream 线程安全读文件 - C/C++ - 清泛网 - 专注C/C++及内核技术

...etline:std::istream& safeGetline(std::istream& is, std::string& t){ t clear(); 使用std::streambuf 函数 safeGetline: std::istream& safeGetline(std::istream& is, std::string& t) { t.clear(); //这比使用std::istream逐个读取它们要快。 //以这种方式使...
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c++11 std::call_once只调用一次函数,类似单例模式 - C/C++ - 清泛网 - 专...

c++11 std::call_once只调用一次函数,类似单例模式std_call_oncestd::call_once 保证函数或者一些代码段在并发或者多线程的情况下,始终只会被执行一次,Demo如下: include <iostream> include <thread>static std::once_flag g_once_flag std::call_once 保证...
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Change date of git tag (or GitHub Release based on it)

I'm adding Releases to my projects on GitHub by adding tags to various commits in the Main branch. 3 Answers ...
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When do I need to use Begin / End Blocks and the Go keyword in SQL Server?

Can someone tell me when and where I need to use begin and end blocks in SQL Server? Also, what exactly does the Go keyword do? ...
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mongodb group values by multiple fields

For example, I have these documents: 3 Answers 3 ...