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Showing content from https://en.cppreference.com/w/cpp/language/../error/../io/basic_streambuf/setp.html below:

std::basic_streambuf<CharT,Traits>::setp - cppreference.com

protected:
void setp( char_type* pbeg, char_type* pend );

Sets the values of the pointers defining the put area.

After the call, pbase() == pbeg, pptr() == pbeg and epptr() == pend are all true.

If any of [pbeg, pend) is not a valid range, the behavior is undefined.

[edit] Parameters pbeg - pointer to the new beginning of the put area pend - pointer to the new end of the put area [edit] Example 
#include <array>
#include <cstddef>
#include <iostream>
 
// Buffer for std::ostream implemented by std::array
template<std::size_t size, class CharT = char>
struct ArrayedStreamBuffer : std::basic_streambuf<CharT>
{
    using Base = std::basic_streambuf<CharT>;
    using char_type = typename Base::char_type;
 
    ArrayedStreamBuffer()
    {
        // put area pointers to work with “buffer”
        Base::setp(buffer.data(), buffer.data() + size);
    }
 
    void print_buffer()
    {
        for (char_type i : buffer)
        {
            if (i == 0)
                std::cout << "\\0";
            else
                std::cout << i;
            std::cout << ' ';
        }
        std::cout << '\n';
    }
 
private:
    std::array<char_type, size> buffer{}; // value-initialize “buffer”
};
 
int main()
{
    ArrayedStreamBuffer<10> streambuf;
    std::ostream stream(&streambuf);
 
    stream << "hello";
    stream << ",";
 
    streambuf.print_buffer();
}

Output:

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 4023 C++98 setp did not require the output sequence to be a valid range requires [edit] See also repositions the beginning, next, and end pointers of the input sequence
(protected member function) [edit]

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