[PATCH] Remove reundant const-qualification from cast targets

[Jonathan Wakely]

static_cast<T const> and const_cast<T const> are meaningless when T is
not a class type, because the result is a prvalue and prvalues of
non-class type are unqualified. I'm removing these pointless
const-qualifications now, because I'm experimenting with a patch to
make the front-end warn about this.

        * include/ext/pb_ds/detail/list_update_map_/iterators_fn_imps.hpp
        (PB_DS_CLASS_C_DEC::end()): Remove redundant const in cast type.
        * testsuite/util/testsuite_rng.h (twister_rand_gen::get_prob()):
        Likewise.

Tested powerpc64le-linux, committed to trunk.



commit e660629ac73bae7caf3e85d95cdfc6dc9d40f27a
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Thu Apr 27 15:50:41 2017 +0100

    Remove reundant const qualification from cast targets
    
        * include/ext/pb_ds/detail/list_update_map_/iterators_fn_imps.hpp
        (PB_DS_CLASS_C_DEC::end()): Remove redundant const in cast type.
        * testsuite/util/testsuite_rng.h (twister_rand_gen::get_prob()):
        Likewise.

diff --git 
a/libstdc++-v3/include/ext/pb_ds/detail/list_update_map_/iterators_fn_imps.hpp 
b/libstdc++-v3/include/ext/pb_ds/detail/list_update_map_/iterators_fn_imps.hpp
index 91fef51..a1b6ed5 100644
--- 
a/libstdc++-v3/include/ext/pb_ds/detail/list_update_map_/iterators_fn_imps.hpp
+++ 
b/libstdc++-v3/include/ext/pb_ds/detail/list_update_map_/iterators_fn_imps.hpp
@@ -75,6 +75,6 @@ inline typename PB_DS_CLASS_C_DEC::const_iterator
 PB_DS_CLASS_C_DEC::
 end() const
 {
-  return const_iterator(0, 0, const_cast<PB_DS_CLASS_C_DEC* const>(this));
+  return const_iterator(0, 0, const_cast<PB_DS_CLASS_C_DEC*>(this));
 }
 
diff --git a/libstdc++-v3/testsuite/util/testsuite_rng.h 
b/libstdc++-v3/testsuite/util/testsuite_rng.h
index fd232fc..84fa750 100644
--- a/libstdc++-v3/testsuite/util/testsuite_rng.h
+++ b/libstdc++-v3/testsuite/util/testsuite_rng.h
@@ -79,8 +79,8 @@ namespace __gnu_pbds
       {
        const double min = m_base_generator.min();
        const double max = m_base_generator.max();
-       const double range = static_cast<const double>(max - min);
-       const double res = static_cast<const double>(m_base_generator() - min);
+       const double range = static_cast<double>(max - min);
+       const double res = static_cast<double>(m_base_generator() - min);
        const double ret = res / range;
        _GLIBCXX_DEBUG_ASSERT(ret >= 0 && ret <= 1);
        return ret;