[istreambuf.iterator.proxy]

Class istreambuf_iterator<charT,traits>::proxy is for exposition only.

An implementation is permitted to provide equivalent functionality without providing a class with this name.

Class istreambuf_iterator<charT, traits>::proxy provides a temporary placeholder as the return value of the post-increment operator (operator+).

It keeps the character pointed to by the previous value of the iterator for some possible future access to get the character.

🔗

namespace std { template<class charT, class traits> class istreambuf_iterator<charT, traits>::proxy { / exposition only charT keep_; basic_streambuf<charT,traits>* sbuf_; proxy(charT c, basic_streambuf<charT,traits>* sbuf) : keep_(c), sbuf_(sbuf) { } public: charT operator*() { return keep_; } }; }