Add docs for find_not.hpp.

doc/algorithm.qbk

@@ -64,6 +64,7 @@ Thanks to all the people who have reviewed this library and made suggestions for
 
 [section:Misc Other Algorithms]
 [include clamp-hpp.qbk]
+[include find.qbk]
 [include gather.qbk]
 [include hex.qbk]
 [include is_palindrome.qbk]

doc/find.qbk

@@ -0,0 +1,80 @@
+[/ File equal.qbk]
+
+[section:equal equal ]
+
+[/license
+Copyright (c) 2018 T. Zachary Laine
+
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+]
+
+The header file 'find_not.hpp' contains a variants of a the stl algorithm
+`find`. The algorithm finds the first value in the given sequence that is not
+equal to the given value.
+
+Consider this use of `find()`:
+
+    auto std::vector<int> vec = { 1, 1, 2 };
+    auto it = std::find(vec.begin(), vec.end(), 1);
+
+This gives us the first occurance of `1` in `vec`.  What if we want to find
+the first occurrance of any number besides `1` in `vec`?  We have to write an
+unfortunate amount of code:
+
+    auto std::vector<int> vec = { 1, 1, 2 };
+    auto it = std::find_if(
+        vec.begin(), vec.end(),
+        [](int i) { return i != 1; });
+
+With `find_not()` the code gets much more terse:
+
+    auto std::vector<int> vec = { 1, 1, 2 };
+    auto it = find_not(vec.begin(), vec.end(), 1);
+
+The existing `find` variants are: `find()`, `find_if()`, and `find_if_not()`.
+It seems natural to also have `find_not()`, for the very reason that we have
+`find_if_not()` -- to avoid having to write a lambda to wrap the negation of
+our find condition.
+
+[heading interface]
+
+``
+template<typename InputIter, typename Sentinel, typename T>        
+InputIter find_not(InputIter first, Sentinel last, T const & x);
+``
+
+The function `find_not` returns the first value in the sequence `[first,
+last)` that is not equal to `x`.
+
+[heading Examples]
+
+Given the container `c1` containing `{ 0, 1, 2 }`,  then
+
+    find_not ( c1.begin (),     c1.end (),    1 ) --> c1.begin()
+    find_not ( c1.begin (),     c1.end (),    0 ) --> std::next(c1.begin())
+
+[heading Iterator Requirements]
+
+`equal` works on all iterators except output iterators.
+
+The template parameter `Sentinel` is allowed to be different from `InputIter`,
+or they may be the same.  For an `InputIter` `it` and a `Sentinel` `end`, `it
+== end` and `it != end` must be well-formed expressions.
+
+[heading Complexity]
+
+Linear.
+
+[heading Exception Safety]
+
+`find_not` takes its parameters by value and do not depend upon any global
+state. Therefore, it provides the strong exception guarantee.
+
+[endsect]
+
+[/ File equal.qbk
+Copyright 2018 T. Zachary Laine
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+]