NAME¶

std::basic_streambuf::setp - std::basic_streambuf::setp

Synopsis¶

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

Sets the values of the pointers defining the put area. Specifically, after the call
pbase() == pbeg, pptr() == pbeg, epptr() == pend.

Parameters¶

pbeg - pointer to the new beginning of the put area
pend - pointer to the new end of the put area

Return value¶

(none)

Example¶

// Run this code

#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:¶

h e l l o , \0 \0 \0 \0

See also¶

setg repositions the beginning, next, and end pointers of the input sequence
(protected member function)