C++ 字符串流的大小

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时间:2020-08-28 15:23:55  来源:igfitidea点击:

Size of stringstream

c++

提问by user963241

Is there any direct way to calculate size of internal string in stringstream?

有什么直接的方法可以计算stringstream中内部字符串的大小吗?

Here, str()returns a copy and then it gets the size of string.

在这里,str()返回一个副本,然后获取字符串的大小。

std::stringstream oss("String");
oss.str().size();

采纳答案by Steve Townsend

std::stringstream oss("String");
oss.seekp(0, ios::end);
stringstream::pos_type offset = oss.tellp();

This is for the write pointer, but the result is the same for read pointer on Visual C++ v10.

这是针对写指针,但结果与 Visual C++ v10 上的读指针相同。

回答by vanneto

There is:

有:

std::stringstream oss("Foo");
oss.seekg(0, ios::end);
int size = oss.tellg();

Now, sizewill contain the size (in bytes) of the string.

现在,size将包含字符串的大小(以字节为单位)。

EDIT:

编辑:

This is also a good idea to put after the above snippet as it puts the internal pointer back to the beginning of the string.

放在上面的代码段之后也是一个好主意,因为它将内部指针放回到字符串的开头。

oss.seekg(0, ios::beg);