Compilation error with unsigned short s = static_cast<const unsigned short&>(unsigned_long_type

[alexvi]

Hi,

Here is some code that was test on 4 compilers: icpc on Linux, aCC on HP-UX, CC on SUN, xlC on AIX

The code was compile without errors on HPUX aCC, SUN CC, AIX xlC, buf failed on icpc.

==========================================
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 C++ Intel 64 Compiler Professional for applications running on Intel 64, Version 11.0 Build 20090318 Package ID: l_cproc_p_11.0.083

Copyright (C) 1985-2009 Intel Corporation. All rights reserved.

> icpc cast_test.cpp

cast_test.cpp(58): error: invalid type conversion: "unsigned long *" to "const unsigned short &"

unsigned short s2 = static_cast(l);

^

cast_test.cpp(59): error: invalid type conversion: "const unsigned long *" to "const unsigned short &"

unsigned short s3 = static_cast(static_cast(l));

^

compilation aborted for cast_test.cpp (code 2)

// ============= cast_test.cpp =============

#include

#include

#include

bool isBigEndian()

{

unsigned short sh = 1;

char* ch = reinterpret_cast(&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(l);

unsigned short s2 = static_cast(l);

unsigned short s3 = static_cast(static_cast(l));

unsigned short s4 = reinterpret_cast(l);

unsigned short s5 = reinterpret_cast(static_cast(l));

SHOW(l);

SHOW(s1);

SHOW(s2);

SHOW(s3);

SHOW(s4);

SHOW(s5);

}

int main()

{

showEnv();

castTest();

return 0;

}

// =======================================

Regards,

Alex

[Judith_W_Intel]

I can reproduce these errorsin version 11.1 but not 12.0. Please upgrade to 12.0 if you would like a fix for this.

Judy

[Om_S_Intel]

This is summarized inhttp://software.intel.com/en-us/articles/the-c-compiler-error-when-doing-static_cast/.