ostringstream的使用

From: http://blog.csdn.net/liminled/article/details/6645451

在std中还有个ostringstream这么方便的格式化输出的工具
 

std::string generate()
{
    ostringstream osm;
    osm << "xxxx " << 1111;

    // 清空之前的内容
    osm.str("");

    // 浮点数转换限制
    double tmp = 123.1234554351236234;
    osm.precision(15);
    osm.setf(std::ios::fixed); // 将浮点数的位数限定为小数点之后的位数
    osm << tmp;

    return osm.str();
}

需要包含的头文件：

#include <sstream>

 

ostringstream作用、主要接口：

[cpp] view plain copy

Output string stream class

ios_base  ios  ostream  ostringstream

ostringstream provides an interface to manipulate strings as if they were output streams.

The objects of this class maintain internally a pointer to a stringbuf object that can be obtained/modified by calling member rdbuf. This streambuf-derived object controls a sequence of characters (string) that can be obtained/modified by calling member str.


Public members
(constructor) Construct an object and optionally initialize its content (constructor member)
rdbuf Get/set the associated stringbuf object (public member function)
str Get/set the associated string object (public member function)