Re: static_cast<unsigned short&>(long_type): 4 different compilers - 3 different behaviors for that statement

Hi,

static_cast<unsigned short&>(long_type);

4 different compilers - 3 different behaviors for that statement.

Regards,

Alex Vinokur

// ============ cast_test.cpp (BEGIN) ============
#include<cstdlib>
#include<iostream>
#include<iomanip>

bool isBigEndian()
{
    unsigned short sh = 1;

    char* ch = reinterpret_cast<char*>(&sh);

    return (0 == *ch);
}

// ---------------
void showCompiler()
{
#if defined __hpux
    system ("aCC -V");
#elif defined _AIX
    system ("xlC -qversion");
#elif defined __sun
    system ("CC -V");
#elif (defined __linux&& defined __INTEL_COMPILER)
    system (" icpc -V");
#else
#error Undefined platform
#endif
}

// ---------------
void showEnv()
{
    std::cout<< std::endl;
    system ("uname -a");

    std::cout<< std::endl;
    showCompiler();
    std::cout<< std::endl;

    std::cout<< "sizeof(long) = "<< sizeof(long)<< std::endl;
    std::cout<< std::endl;

    std::cout<< "ENDIAN: "<< (isBigEndian() ? "BIG" : "LITTLE")<<
std::endl;
    std::cout<< std::endl;
}

// -------------
void castTest()
{

#define SHOW(x) std::cout<< std::setw(2)<< std::left<< #x<<
std::right<< " = "<< std::hex<< std::showbase<< x<< std::dec<<
std::endl

    unsigned long l = 0x13579bdf2458ace0;
    unsigned short s1 = static_cast<unsigned short>(l);

    unsigned short s2 = static_cast<const unsigned short&>(l);
    unsigned short s3 = static_cast<const unsigned
short&>(static_cast<const unsigned long&>(l));

    unsigned short s4 = reinterpret_cast<const unsigned short&>(l);
    unsigned short s5 = reinterpret_cast<const unsigned
short&>(static_cast<const unsigned long&>(l));

   SHOW(l);
   SHOW(s1);
   SHOW(s2);
   SHOW(s3);
   SHOW(s4);
   SHOW(s5);

}

int main()
{
    showEnv();
    castTest();

    return 0;
}

// ============ cast_test.cpp (END) ============

Compilation and running

// ====== cast test on HP-UX ======


// No errors


HP-UX hpx418 B.11.23 U ia64 1139467043 unlimited-user license

aCC: HP C/aC++ B3910B A.06.25.01 [May 16 2010]

sizeof(long) = 8

ENDIAN: BIG

l = 0x13579bdf2458ace0
s1 = 0xace0
s2 = 0xace0
s3 = 0xace0
s4 = 0x1357
s5 = 0x1357

// ====== cast test on SUN ======


// No errors


SunOS ilsun015 5.10 Generic_139555-08 sun4u sparc SUNW,SPARC-
Enterprise

CC: Sun C++ 5.10 SunOS_sparc 128228-08 2010/04/21
Usage: CC [ options ] files. Use 'CC -flags' for details

sizeof(long) = 8

ENDIAN: BIG

l = 0x13579bdf2458ace0
s1 = 0xace0
s2 = 0x1357
s3 = 0x1357
s4 = 0x1357
s5 = 0x1357

// ====== cast test on AIX ======


// No errors

AIX ep5512b 1 6 000497A2D900

IBM XL C/C++ for AIX, V10.1
Version: 10.01.0000.0000

sizeof(long) = 8

ENDIAN: BIG

l = 0x13579bdf2458ace0
s1 = 0xace0
s2 = 0xace0
s3 = 0xace0
s4 = 0x1357
s5 = 0x1357

// ====== cast test on Linix& INTEL-compiler ======

Linux illin025 2.6.18-92.1.22.el5 #1 SMP Fri Dec 5 09:28:22 EST 2008
x86_64 x86_64 x86_64 GNU/Linux

Intel(R) C++ Intel(R) 64 Compiler Professional for applications
running on Intel(R) 64, Version 11.0 Build 20090318 Package ID:
l_cproc_p_11.0.083
Copyright (C) 1985-2009 Intel Corporation. All rights reserved.


cast_test.cpp(58): error: invalid type conversion: "unsigned long *"
to "const unsigned short&"
unsigned short s2 = static_cast<const unsigned short&>(l);
^

cast_test.cpp(59): error: invalid type conversion: "const unsigned
long *" to "const unsigned short&"
unsigned short s3 = static_cast<const unsigned
short&>(static_cast<const unsigned long&>(l));
^

compilation aborted for cast_test.cpp (code 2)