Boost.RangeEx merged into Boost.Range

[SVN r60897]

doc/reference/adaptors/replaced_if.qbk

@@ -0,0 +1,52 @@
+[section:replaced_if replaced_if]
+
+[table
+    [[Syntax] [Code]]
+    [[Pipe] [`rng | boost::adaptors::replaced_if(pred, new_value)`]]
+    [[Function] [`boost::adaptors::replace_if(rng, pred, new_value)`]]
+]
+
+* [*Precondition:]
+    * The range `value_type` is convertible to the argument type of `pred`.
+    * `new_value` is convertible to the `value_type` of the range.
+* [*Postconditions:] For all elements `x` in the returned range, the value `x` is equal to the value of `pred(y) ? new_value : y` where `y` is the corresponding element in the original range.
+* [*Range Category:] `ForwardRange`
+
+[section:replaced_if_example replaced_if example]
+``
+#include <boost/range/adaptor/replaced_if.hpp>
+#include <boost/range/algorithm/copy.hpp>
+#include <boost/assign.hpp>
+#include <algorithm>
+#include <iostream>
+#include <vector>
+
+struct is_even
+{
+    bool operator()(int x) const { return x % 2 == 0; }
+};
+
+int main(int argc, const char* argv[])
+{
+    using namespace boost::adaptors;
+    using namespace boost::assign;
+
+    std::vector<int> input;
+    input += 1,2,3,4,5,6,7,8,9;
+
+    boost::copy(
+        input | replaced_if(is_even(), 10),
+        std::ostream_iterator<int>(std::cout, ","));
+
+    return 0;
+}
+``
+[endsect]
+
+This would produce the output:
+``
+1,10,3,10,5,10,7,10,9
+``
+[endsect]
+
+