std::basic_streambuf::setp
From cppreference.com
< 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
| repositions the beginning, next, and end pointers of the input sequence (protected member function) |