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### 3108. `istreambuf_iterator::proxy::operator*` should be `const`

Section: 23.6.4.2 [istreambuf.iterator.proxy] Status: New Submitter: Billy O'Neal III Opened: 2018-04-26 Last modified: 2020-09-06

Priority: 3

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Discussion:

`operator*` on iterators is usually intended to be `const`; see 23.3.5.3 [input.iterators] Table 87, `*a`, where `a` is of type `X` or `const X`. (Technically, `proxy` is implementing the `*r++` requirement in this table, and `r` doesn't imply a const iterator, but there's no reason for the iterator's `operator*` to differ from the proxy)

[2018-06-18 after reflector discussion]

Priority set to 3

Proposed resolution:

This wording is relative to N4741.

1. Edit 23.6.4.2 [istreambuf.iterator.proxy] as indicated:

   >     namespace std {
   >       template<class charT, class traits = char_traits<charT>>
   >       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*() const { return keep_; }
   >       };
   >     }