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Showing content from http://en.cppreference.com/w/cpp/../cpp/../cpp/../cpp/symbol_index/../io/strstream/pcount.html below:

std::strstream::pcount - cppreference.com

int pcount() const;

Returns the number of characters that were output in the put area of the associated std::strstreambuf. Effectively calls rdbuf()->pcount().

(none)

The number of characters in the put area, or zero if nothing was output.

#include <iostream>
#include <strstream>
 
int main()
{
    std::strstream dyn; // dynamically-allocated output buffer
    dyn << "Test: " << 1.23 << std::ends;
    std::cout << "The size of the output is " << dyn.pcount()
              << " and it holds \"" << dyn.str() << "\"\n";
    dyn.freeze(false);
 
    char buf[10];
    std::strstream user(buf, 10); // user-provided output buffer
    user << 1.23; // note: no std::ends
    std::cout.write(buf, user.pcount());
    std::cout << '\n';
}

Output:

The size of the output is 11 and it holds "Test: 1.23"
1.23

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