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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：
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)
一个非常简单又快捷的格式化输出工具。
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