std::strstreambuf::pcount
From cppreference.com
< cpp | io | strstreambuf
int pcount()const; | (deprecated in C++98) (removed in C++26) | |
Returns the number of characters written to the output sequence.
If the next pointer for the put area (std::streambuf::pptr()) is a null pointer, returns zero.
Otherwise, returns the next pointer in the put area minus the beginning pointer in the put area, that is pptr()- pbase().
Contents |
[edit]Parameters
(none)
[edit]Return value
The number of characters written to the put area.
[edit]Example
Run this code
#include <iostream>#include <strstream> int main(){std::strstream dyn;// dynamically-allocated output buffer dyn <<"Test: "<<1.23<<std::ends;std::strstreambuf* buf = dyn.rdbuf();std::cout<<"The size of the output is "<< buf->pcount()// or just buf.pcount()<<" and it holds \""<< dyn.str()<<"\"\n"; dyn.freeze(false);// after calling .str() on a dynamic strstream char arr[10];std::ostrstream user(arr, 10);// user-provided output buffer buf = user.rdbuf(); user <<1.23;// note: no std::endsstd::cout.write(arr, buf->pcount());// or just user.pcount()std::cout<<'\n'; std::istrstream lit("1 2 3");// read-only fixed-size buffer buf = lit.rdbuf();// istrstream has no member pcount(), so lit.pcount() won't workstd::cout<<"Input-only pcount() = "<< buf->pcount()<<'\n';}
Output:
The size of the output is 11 and it holds "Test: 1.23" 1.23 Input-only pcount() = 0
[edit]See also
| obtains the number of characters written (public member function of std::strstream) | |
| obtains the number of characters written (public member function of std::ostrstream) |
