std::ostrstream::freeze
STD：：发情期：冻结
| void freeze(bool flag = true | | |
|---|
如果流使用动态分配的数组进行输出，则禁用%28。flag == true%29或启用%28flag == false%29缓冲区的自动分配/取消分配。有效呼叫rdbuf()->freeze(flag)...
注记
在打电话给str()动态流自动冻结。打电话给freeze(false)在退出ostrstream对象被创建。否则，析构函数将泄漏内存。另外，当被冻结的流到达分配缓冲区的末尾时，可能会截断它的额外输出。
参数
| flag | - | desired status |
|---|
返回值
%280%29
例
二次
#include <strstream>
#include <iostream>
int main()
{
std::ostrstream dyn; // dynamically-allocated output buffer
dyn << "Test: " << 1.23; // note: no std::ends to demonstrate appending
std::cout << "The output stream contains \"";
std::cout.write(dyn.str(), dyn.pcount()) << "\"\n";
// the stream is now frozen due to str()
dyn << " More text"; // output to a frozen stream may be truncated
std::cout << "The output stream contains \"";
std::cout.write(dyn.str(), dyn.pcount()) << "\"\n";
dyn.freeze(false // freeze(false) must be called or the destructor will leak
std::ostrstream dyn2; // dynamically-allocated output buffer
dyn2 << "Test: " << 1.23; // note: no std::ends
std::cout << "The output stream contains \"";
std::cout.write(dyn2.str(), dyn2.pcount()) << "\"\n";
dyn2.freeze(false // unfreeze the stream after str()
dyn2 << " More text" << std::ends; // output will not be truncated (buffer grows)
std::cout << "The output stream contains \"" << dyn2.str() << "\"\n";
dyn2.freeze(false // freeze(false) must be called or the destructor will leak
}
二次
可能的产出：
二次
The output stream contains "Test: 1.23"
The output stream contains "Test: 1.23 More "
The output stream contains "Test: 1.23"
The output stream contains "Test: 1.23 More text"
二次
另见
| freeze | sets/clears the frozen state of the buffer (public member function of std::strstreambuf) |
|---|
© cppreference.com
在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。
