std::strstreambuf::pcount
From cppreference.com
< cpp | io | strstreambuf
| int pcount() const; |
||
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 <strstream> #include <iostream> 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
| obtains the number of characters written (public member function of std::strstream) | |
| obtains the number of characters written (public member function of std::ostrstream) |