strstreambuf::freeze

导致流缓冲区不可通过流缓冲区操作。

void freeze( 
   bool _Freezeit = true 
);

参数

  • _Freezeit
    指示是否希望 bool 的流冻结。

备注

如果 _Freezeit 为 true,函数修改存储的 strstreambuf 模式使控制冻结的序列。 否则,它使未冻结的顺序控制。

str 暗指 freeze

备注

冻结的缓冲区。会在 strstreambuf 析期间释放。在被释放之前,避免内存泄漏必须解冻缓冲区。

示例

// strstreambuf_freeze.cpp
// compile with: /EHsc

#include <iostream>
#include <strstream>

using namespace std;

void report(strstream &x)
{
    if (!x.good())
        cout << "stream bad" << endl;
    else
        cout << "stream good" << endl;
}

int main()
{
    strstream x;

    x << "test1";
    cout << "before freeze: ";
    report(x);

    // Calling str freezes stream.
    cout.write(x.rdbuf()->str(), 5) << endl;
    cout << "after freeze: ";
    report(x);

    // Stream is bad now, wrote on frozen stream
    x << "test1.5";
    cout << "after write to frozen stream: ";
    report(x);

    // Unfreeze stream, but it is still bad
    x.rdbuf()->freeze(false);
    cout << "after unfreezing stream: ";
    report(x);

    // Clear stream
    x.clear();
    cout << "after clearing stream: ";
    report(x);

    x << "test3";
    cout.write(x.rdbuf()->str(), 10) << endl;

    // Clean up.  Failure to unfreeze stream will cause a
    // memory leak.
    x.rdbuf()->freeze(false);
}
  

要求

页眉: <strstream>

命名空间: std

请参见

参考

strstreambuf 类

iostream 编程

iostreams 约定