Subject: [Boost-commit] svn:boost r62385 - sandbox/SOC/2010/bits_and_ints/boost/integer/detail
From: muriloufg_at_[hidden]
Date: 2010-06-02 13:40:53
Author: murilov
Date: 2010-06-02 13:40:52 EDT (Wed, 02 Jun 2010)
New Revision: 62385
URL: http://svn.boost.org/trac/boost/changeset/62385
Log:
Added a constraint is_integral for the static_bit_reversal template struct.
Text files modified:
sandbox/SOC/2010/bits_and_ints/boost/integer/detail/static_bit_reversal.hpp | 39 ++++++++++++++++++++++++++++-----------
1 files changed, 28 insertions(+), 11 deletions(-)
Modified: sandbox/SOC/2010/bits_and_ints/boost/integer/detail/static_bit_reversal.hpp
==============================================================================
--- sandbox/SOC/2010/bits_and_ints/boost/integer/detail/static_bit_reversal.hpp (original)
+++ sandbox/SOC/2010/bits_and_ints/boost/integer/detail/static_bit_reversal.hpp 2010-06-02 13:40:52 EDT (Wed, 02 Jun 2010)
@@ -25,29 +25,46 @@
namespace boost
{
+namespace bits_and_ints_private {
+
// Base container
-template <typename T, T val>
+template <typename T, T data>
struct static_bit_reversal_base
{
- BOOST_STATIC_CONSTANT(T, value = val);
+ BOOST_STATIC_CONSTANT(T, value = data);
};
-// @TODO: shift template parameter
-// must not be changeable by user
-template <typename T, T val, std::size_t shift = sizeof(T) * 8>
-struct static_bit_reversal :
+// Recursion implementation
+template <typename T, T data, std::size_t shift>
+struct static_bit_reversal_impl :
public static_bit_reversal_base<T,
- ((is_bit_set<T, val, (sizeof(T) * 8 - shift)>::value << (shift - 1))
- + static_bit_reversal<T, val, shift - 1>::value)
+ ((is_bit_set<T, data, (sizeof(T) * 8 - shift)>::value << (shift - 1))
+ + static_bit_reversal_impl<T, data, shift - 1>::value)
>
{};
// Base case
-template <typename T, T val>
-struct static_bit_reversal<T, val, 0> :
+template <typename T, T data>
+struct static_bit_reversal_impl<T, data, 0> :
static_bit_reversal_base<T, T(0)> {};
+} // bits_and_ints_private
+
+// If T is not an integral type, static_bit_reversal<T, data>::value call
+// will result an error.
+template <typename T, T data, class Enable = void>
+struct static_bit_reversal {};
+
+// If T is an integral type, static_bit_reversal<T, data>::value will
+// be `data' with the bits reversed
+template <typename T, T data>
+struct static_bit_reversal<T, data, typename enable_if<is_integral<T> >::type> {
+ BOOST_STATIC_CONSTANT(T, value =
+ (bits_and_ints_private::static_bit_reversal_impl<T, data, sizeof(T) * 8>::value)
+ );
+};
+
} // boost
-#endif
\ No newline at end of file
+#endif
\ No newline at end of file