From: "Randy Maddox" <rmaddox AT isicns DOT com>
To: <djgpp AT delorie DOT com>
Cc: "Randy Maddox" <rmaddox AT isicns DOT com>
Subject: Problem with template member of template class
Date: Wed, 28 Nov 2001 09:16:49 -0500
Message-ID: <000e01c17817$520a1d20$3502a8c0@nancy>
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Reply-To: djgpp AT delorie DOT com

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Hello,

I am using the WinDoze 2K version of DJGPP as found in the zip archive
djdev204_alpha_win2k.zip and have encountered an issue compiling a template
member of a template class.  This works fine only so long as the template
member is both declared and defined in the class declarations.  However, as
soon as I try to define the template member outside of the class
declarations I get a compile error.  For example:

- This compiles fine and works as expected:

// test driver for template class template member

#include <iostream>

template <typename T1> class Test
{
public:

  Test(const T1 & privateValue)
    : privateValue_(privateValue)
  { }

  template <typename T2>
  void Write(const T2 & value)
  {
    std::cout << "Write() value is:  " << value << std::endl;
    std::cout << "privateValue is:   " << privateValue_ << std::endl
              << std::endl;
  }

private:

  const T1    privateValue_;
};

int main()
{
  std::cout << "Start of test driver" << std::endl << std::endl;

  Test<double>    test(3.3);

  test.Write("string value");

  test.Write(4);

  std::cout << std::endl << "End of test driver" << std::endl;
}

// end of this file


However, if I try to move the definition of Write() outside of the class
declarations as shown here:

// test driver for template class template member

#include <iostream>

template <typename T1> class Test
{
public:

  Test(const T1 & privateValue)
    : privateValue_(privateValue)
  { }

  template <typename T2>
  void Write(const T2 & value);

private:

  const T1    privateValue_;
};


template <typename T1>
template <typename T2>
void Test<T1>::Write<T2>(const T2 & value)
{
  std::cout << "Write() value is:  " << value << std::endl;
  std::cout << "privateValue is:   " << privateValue_ << std::endl
            << std::endl;
}


int main()
{
  std::cout << "Start of test driver" << std::endl << std::endl;

  Test<double>    test(3.3);

  test.Write("string value");

  test.Write(4);

  std::cout << std::endl << "End of test driver" << std::endl;
}

// end of this file


Then I get the following compile error:

>gxx test2.cpp
test2.cpp:25: partial specialization `Write<T2>' of function template

Since, as far as I can tell from the Standard, this looks like the correct
syntax why do I get this error?  Is this a bug?  An unsupported feature?  Or
do I just not actually understand the syntax?

Using gxx -v reports the following:

>gxx -v
Reading specs from C:/djgpp/bin/../lib/gcc-lib/djgpp/3.02/specs
Configured with: ../configure i586-pc-msdosdjgpp --prefix=/dev/env/DJDIR
--disable-nls
Thread model: single
gcc version 3.0.2
 C:/djgpp/bin/../lib/gcc-lib/djgpp/3.02/collect2.exe c:/djgpp/lib/crt0.o
-LC:/djgpp/bin/../lib/
gcc-lib/djgpp/3.02 -LC:/djgpp/bin/../lib/gcc-lib -Lc:/djgpp/lib
-Lc:/djgpp/lib/gcc-lib/djgpp/3.
02 -Lc:/djgpp/bin -Lc:/djgpp/lib
-LC:/djgpp/bin/../lib/gcc-lib/djgpp/3.02/../../.. -Lc:/djgpp/l
ib/gcc-lib/djgpp/3.02/../../.. -lstdcxx -lm -lgcc -lc -lgcc -Tdjgpp-x.djl

Thanks.

Randy Maddox
C++ Author, Architect, Developer
703-883-8088 ext. 119 (8 am to 4:30 pm Eastern USA time)
rmaddox AT isicns DOT com


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