uhd: Replace all occurrences of boost::bind with std::bind

Note: Replacing everything with a lambda would be even better, but that
can't be easily scripted so we'll do this as a first step to reduce the
Boost footprint.

This also removes occurences of #include <boost/bind.hpp>, and makes
sure all usages of std::bind have an #include <functional>. clang-format
wasn't always applied to minimize the changeset in this commit, however,
it was applied to the blocks of #includes.

Due to conflicts with other Boost libraries, the placeholders _1, _2,
etc. could not be directly used, but had to be explicitly called out
(as std::placeholders::_1, etc.). This makes the use of std::bind even
uglier, which serves as another reminder that using std::bind (and even
more so, boost::bind) should be avoided.

nirio/rpc/rpc_client.cpp still contains a reference to boost::bind. It
was not possible to remove it by simply doing a search and replace, so
it will be removed in a separate commit.

1 files changed, 2 insertions, 2 deletions

diff --git a/host/lib/utils/gain_group.cpp b/host/lib/utils/gain_group.cpp
index cda10a881..32f14d062 100644
--- a/host/lib/utils/gain_group.cpp
+++ b/host/lib/utils/gain_group.cpp
@@ -10,8 +10,8 @@
 #include <uhd/utils/algorithm.hpp>
 #include <uhd/utils/gain_group.hpp>
 #include <uhd/utils/log.hpp>
-#include <boost/bind.hpp>
 #include <algorithm>
+#include <functional>
 #include <vector>
 
 using namespace uhd;
@@ -130,7 +130,7 @@ public:
         }
         std::sort(indexes_step_size_dec.begin(),
             indexes_step_size_dec.end(),
-            boost::bind(&compare_by_step_size, _1, _2, all_fcns));
+            std::bind(&compare_by_step_size, std::placeholders::_1, std::placeholders::_2, all_fcns));
         UHD_ASSERT_THROW(all_fcns.at(indexes_step_size_dec.front()).get_range().step()
                          >= all_fcns.at(indexes_step_size_dec.back()).get_range().step());