# std::basic_streambuf::setp

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< cpp‎ | io‎ | basic streambuf

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 <iostream>
    #include <array>

    // Buffer for std::ostream implemented by std::array
    template<std::size_t SIZE, class CharT = char>
    class ArrayedStreamBuffer : public std::basic_streambuf<CharT>
    {
    public:
        using Base = std::basic_streambuf<CharT>;
        using char_type = typename Base::char_type;

        ArrayedStreamBuffer() : buffer_{} // value-initialize buffer_ to all zeroes
        {
            Base::setp(buffer_.begin(), buffer_.end()); // set std::basic_streambuf
                // put area pointers to work with 'buffer_'
        }

        void print_buffer()
        {
            for (const auto& i: buffer_) {
                if (i == 0) {
                    std::cout << "NULL";
                } else {
                    std::cout << i;
                }
                std::cout << " ";
            }
            std::cout << "\n";
        }

    private:
        std::array<char_type, SIZE> buffer_;
    };

    int main()
    {
        ArrayedStreamBuffer<10> streambuf;
        std::ostream stream(&streambuf);

        stream << "hello";
        stream << ",";

        streambuf.print_buffer();
    }

Output:

    h e l l o , NULL NULL NULL NULL

### See also

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

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