[Boost-commit] svn:boost r62452 - in sandbox/SOC/2010/bits_and_ints: boost/integer libs/integer/test

Subject: [Boost-commit] svn:boost r62452 - in sandbox/SOC/2010/bits_and_ints: boost/integer libs/integer/test
From: muriloufg_at_[hidden]
Date: 2010-06-05 13:34:38

Author: murilov
Date: 2010-06-05 13:34:37 EDT (Sat, 05 Jun 2010)
New Revision: 62452
URL: http://svn.boost.org/trac/boost/changeset/62452

Log:
Added same_sign() function and static_same_sign metafunction
Added:
   sandbox/SOC/2010/bits_and_ints/boost/integer/same_sign.hpp   (contents, props changed)
   sandbox/SOC/2010/bits_and_ints/libs/integer/test/same_sign_test.cpp   (contents, props changed)
Text files modified: 
   sandbox/SOC/2010/bits_and_ints/boost/integer/bits_and_ints.hpp |     1 +                                       
   1 files changed, 1 insertions(+), 0 deletions(-)

Modified: sandbox/SOC/2010/bits_and_ints/boost/integer/bits_and_ints.hpp
==============================================================================
--- sandbox/SOC/2010/bits_and_ints/boost/integer/bits_and_ints.hpp	(original)
+++ sandbox/SOC/2010/bits_and_ints/boost/integer/bits_and_ints.hpp	2010-06-05 13:34:37 EDT (Sat, 05 Jun 2010)
@@ -18,5 +18,6 @@
 #include <boost/integer/bit_reversal.hpp>
 #include <boost/integer/static_bit_reversal.hpp>
 #include <boost/integer/sign.hpp>
+#include <boost/integer/same_sign.hpp>
 
 #endif
\ No newline at end of file

Added: sandbox/SOC/2010/bits_and_ints/boost/integer/same_sign.hpp
==============================================================================
--- (empty file)
+++ sandbox/SOC/2010/bits_and_ints/boost/integer/same_sign.hpp	2010-06-05 13:34:37 EDT (Sat, 05 Jun 2010)
@@ -0,0 +1,51 @@
+//  Boost integer/same_sign.hpp header file  ------------------------------//
+
+//  (C) Copyright Murilo Adriano Vasconcelos 2010.
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt
+
+//  See http://www.boost.org for updates, documentation, and revision history. 
+
+#include <boost/type_traits/is_integral.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <boost/integer/bit_utils.hpp>
+#include <limits>
+
+namespace boost
+{
+
+/*
+ *	same_sign(first, second) returns:
+ *		- false: if the signs of first and second are different
+ *		- true: if the signs are equal
+ */
+	
+template <typename T>
+inline typename enable_if<is_integral<T>, bool>::type
+same_sign(T first, T second)
+{
+	T temp = first ^ second;
+	temp = temp >> ((sizeof(T) * 8) - 1);
+	temp = temp & T(1);
+	
+	return !temp;
+}
+
+/*
+ *	Compile-time version of same_sign
+ *
+ *	static_same_sign<type, FIRST, SECOND>::value will be:
+ *		- false: if the signs of FIRST and SECOND are different
+ *		- true: if the signs are equal
+ */
+template <typename T, T first, T second, class Enable = typename enable_if<is_integral<T> >::type>
+struct static_same_sign
+{
+private:
+	static const int temp = (first ^ second) >> ((sizeof(T) * 8) - 1);
+public:
+	BOOST_STATIC_CONSTANT(bool, value = !(temp & 1));
+};
+	
+}
\ No newline at end of file

Added: sandbox/SOC/2010/bits_and_ints/libs/integer/test/same_sign_test.cpp
==============================================================================
--- (empty file)
+++ sandbox/SOC/2010/bits_and_ints/libs/integer/test/same_sign_test.cpp	2010-06-05 13:34:37 EDT (Sat, 05 Jun 2010)
@@ -0,0 +1,39 @@
+//  Boost same_sign_test.hpp test program  --------------------------------------//
+
+//  (C) Copyright Murilo Adriano Vasconcelos 2010.
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/detail/lightweight_test.hpp>
+#include <boost/integer/bits_and_ints.hpp> 
+
+#include <iostream>  
+
+// Macros to compact code
+#define SAME_SIGN_TEST(n, m, r) \
+BOOST_TEST(::boost::same_sign(n, m) == r)
+
+#define STATIC_SAME_SIGN_TEST(t, n, m, r) \
+BOOST_TEST((::boost::static_same_sign<t, n, m>::value == r))
+
+
+// Main testing function
+int main(int, char* [])
+{    
+	std::cout << "Doing tests on same_sign." << std::endl;
+	
+	for (int i = 0; i != 101; ++i) {
+		for (int j = -100; j != 1; ++j) {
+			SAME_SIGN_TEST(i, j, false);
+			STATIC_SAME_SIGN_TEST(int, i, j, false);
+		}
+		for (int j = 0; j != 100; ++j) {
+			SAME_SIGN_TEST(i, j, true);
+			STATIC_SAME_SIGN_TEST(int, i, j, true);
+		}
+	}
+	
+	return boost::report_errors();
+}
+