[istreambuf.iterator.cons] - C++14 → C++17

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@@ -1,25 +1,30 @@
 #### `istreambuf_iterator` constructors <a id="istreambuf.iterator.cons">[[istreambuf.iterator.cons]]</a>
 ``` cpp
 constexpr istreambuf_iterator() noexcept;
 ```
-*Effects:* Constructs the end-of-stream iterator.
 ``` cpp
-istreambuf_iterator(basic_istream<charT,traits>& s) noexcept;
-istreambuf_iterator(basic_streambuf<charT,traits>* s) noexcept;
 ```
-*Effects:* Constructs an `istreambuf_iterator<>` that uses the
-`basic_streambuf<>` object `*(s.rdbuf())`, or `*s`, respectively.
-Constructs an end-of-stream iterator if `s.rdbuf()` is null.
 ``` cpp
 istreambuf_iterator(const proxy& p) noexcept;
 ```
-*Effects:* Constructs a `istreambuf_iterator<>` that uses the
-`basic_streambuf<>` object pointed to by the `proxy` object’s
-constructor argument `p`.

 #### `istreambuf_iterator` constructors <a id="istreambuf.iterator.cons">[[istreambuf.iterator.cons]]</a>
+For each `istreambuf_iterator` constructor in this section, an
+end-of-stream iterator is constructed if and only if the exposition-only
+member `sbuf_` is initialized with a null pointer value.
 ``` cpp
 constexpr istreambuf_iterator() noexcept;
 ```
+*Effects:* Initializes `sbuf_` with `nullptr`.
 ``` cpp
+istreambuf_iterator(istream_type& s) noexcept;
 ```
+*Effects:* Initializes `sbuf_` with `s.rdbuf()`.
+``` cpp
+istreambuf_iterator(streambuf_type* s) noexcept;
+```
+*Effects:* Initializes `sbuf_` with `s`.
 ``` cpp
 istreambuf_iterator(const proxy& p) noexcept;
 ```
+*Effects:* Initializes `sbuf_` with `p.sbuf_`.

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