std::strstreambuf::pcount
From cppreference.com
< cpp | io | strstreambuf
| int pcount() const;
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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 <strstream> #include <iostream> int main() { std::strstream dyn; // dynamically-allocated output buffer dyn << "Test: " << 1.23; 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 10 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)
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| obtains the number of characters written (public member function of std::ostrstream)
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