std::strstreambuf::pcount(3)

NAME
std::strstreambuf::pcount - std::strstreambuf::pcount

Synopsis
   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().

Parameters
   (none)

Return value
   The number of characters written to the put area.

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::ends
     std::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 work
     std::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

See also
   pcount obtains the number of characters written
          (public member function of std::strstream)
   pcount obtains the number of characters written
          (public member function of std::ostrstream)