Updated to use boost/bind/bind.hpp to avoid warnings and compliance with C++20.

boost/bind.hpp emits warnings about deprecating global placeholder argument
keywords. C++20 removes std::bind1st/bind2nd, so replaced their usage with
boost::bind.

doc/quickbook/filter_iterator.qbk

@@ -50,11 +50,11 @@ the integers greater than `-2`.
       // Another example using make_filter_iterator()
       std::copy(
           boost::make_filter_iterator(
-              std::bind2nd(std::greater<int>(), -2)
+              std::bind(std::greater<int>(), std::placeholders::_1, -2)
             , numbers, numbers + N)
 
         , boost::make_filter_iterator(
-              std::bind2nd(std::greater<int>(), -2)
+              std::bind(std::greater<int>(), std::placeholders::_1, -2)
             , numbers + N, numbers + N)
 
         , std::ostream_iterator<int>(std::cout, " ")

doc/quickbook/indirect_iterator.qbk

@@ -49,7 +49,7 @@ using the `make_indirect_iterator` helper function.
       const_indirect_last(pointers_to_chars + N);
 
     std::transform(const_indirect_first, const_indirect_last,
-      mutable_indirect_first, std::bind1st(std::plus<char>(), 1));
+      mutable_indirect_first, std::bind(std::plus<char>(), 1, std::placeholders::_1));
 
     std::copy(mutable_indirect_first, mutable_indirect_last,
       std::ostream_iterator<char>(std::cout, ","));

example/filter_iterator_example.cpp

@@ -8,6 +8,7 @@
 #include <functional>
 #include <iostream>
 #include <boost/iterator/filter_iterator.hpp>
+#include <boost/bind/bind.hpp>
 #include <boost/cstdlib.hpp> // for exit_success
 
 struct is_positive_number {
@@ -42,11 +43,11 @@ int main()
   // Another example using make_filter_iterator()
   std::copy(
       boost::make_filter_iterator(
-          std::bind2nd(std::greater<int>(), -2)
+          boost::bind(std::greater<int>(), boost::placeholders::_1, -2)
         , numbers, numbers + N)
             
     , boost::make_filter_iterator(
-          std::bind2nd(std::greater<int>(), -2)
+          boost::bind(std::greater<int>(), boost::placeholders::_1, -2)
         , numbers + N, numbers + N)
       
     , std::ostream_iterator<int>(std::cout, " ")

example/indirect_iterator_example.cpp

@@ -9,6 +9,7 @@
 #include <iterator>
 #include <functional>
 #include <algorithm>
+#include <boost/bind/bind.hpp>
 #include <boost/iterator/indirect_iterator.hpp>
 
 int main(int, char*[])
@@ -41,7 +42,7 @@ int main(int, char*[])
     const_indirect_last(pointers_to_chars + N);
 
   std::transform(const_indirect_first, const_indirect_last,
-                 mutable_indirect_first, std::bind1st(std::plus<char>(), 1));
+                 mutable_indirect_first, boost::bind(std::plus<char>(), 1, boost::placeholders::_1));
 
   std::copy(mutable_indirect_first, mutable_indirect_last,
             std::ostream_iterator<char>(std::cout, ","));

test/transform_iterator_test.cpp

@@ -19,7 +19,6 @@
 #include <boost/iterator/iterator_concepts.hpp>
 #include <boost/iterator/new_iterator_tests.hpp>
 #include <boost/pending/iterator_tests.hpp>
-#include <boost/bind.hpp>
 #include <boost/concept_check.hpp>
 
 #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION