Add order_test.cpp

test/Jamfile.v2

@@ -79,3 +79,5 @@ endian-run float_typedef_test.cpp ;
 endian-run data_test.cpp ;
 
 endian-run endian_hpp_test.cpp ;
+
+run order_test.cpp ;

test/order_test.cpp

@@ -0,0 +1,87 @@
+// Copyright 2019 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0.
+// http://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/endian/detail/order.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+#include <cstddef>
+#include <ostream>
+#include <iomanip>
+
+#if defined(_MSC_VER)
+# pragma warning(disable: 4127)  // conditional expression is constant
+#endif
+
+class byte_span
+{
+private:
+
+    unsigned char const * p_;
+    std::size_t n_;
+
+public:
+
+    byte_span( unsigned char const * p, std::size_t n ): p_( p ), n_( n )
+    {
+    }
+
+    template<std::size_t N> explicit byte_span( unsigned char const (&a)[ N ] ): p_( a ), n_( N )
+    {
+    }
+
+    bool operator==( byte_span const& r ) const
+    {
+        if( n_ != r.n_ ) return false;
+
+        for( std::size_t i = 0; i < n_; ++i )
+        {
+            if( p_[ i ] != r.p_[ i ] ) return false;
+        }
+
+        return true;
+    }
+
+    friend std::ostream& operator<<( std::ostream& os, byte_span s )
+    {
+        if( s.n_ == 0 ) return os;
+
+        os << std::hex << std::setfill( '0' ) << std::uppercase;
+
+        os << std::setw( 2 ) << +s.p_[ 0 ];
+
+        for( std::size_t i = 1; i < s.n_; ++i )
+        {
+            os << ':' << std::setw( 2 ) << +s.p_[ i ];
+        }
+
+        os << std::dec << std::setfill( ' ' ) << std::nouppercase;
+
+        return os;
+    }
+};
+
+int main()
+{
+    boost::uint64_t v = static_cast<boost::uint64_t>( 0x0102030405060708ull );
+    byte_span v2( reinterpret_cast<unsigned char const*>( &v ), sizeof(v) );
+
+    if( boost::endian::order::native == boost::endian::order::little )
+    {
+        unsigned char w[] = { 8, 7, 6, 5, 4, 3, 2, 1 };
+        BOOST_TEST_EQ( v2, byte_span( w ) );
+    }
+    else if( boost::endian::order::native == boost::endian::order::big )
+    {
+        unsigned char w[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
+        BOOST_TEST_EQ( v2, byte_span( w ) );
+    }
+    else
+    {
+        BOOST_ERROR( "boost::endian::order::native is neither big nor little" );
+    }
+
+    return boost::report_errors();
+}