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Re: C++ PATCH: PR3637

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Dear Mr Mitchell,

thank you for your reply. I had the same idea of prepending the 
typename keyword to c1<typename traits<_T>::next>::template
c2<void>(); but gcc 3.1 does reject the code. If I add -pedantic to
the command line everything works as expected. Sorry about that. 

recursivetemplate2.cpp
#include <iostream>

using namespace std;

template <class _T> struct traits
{
	typedef long next;
};


template <class _T>
	struct c1
	{
		c1()
		{
			cout << __PRETTY_FUNCTION__ << endl;
		}

		template <class _U>
			struct c2
			{
				c1 c;
			};
	};


template <class _T>
	void foo()
	{
		cout << __PRETTY_FUNCTION__ << endl;
		typename c1<typename traits<_T>::next>::c2<void>();
	}


int main()
{
	foo<int>();
	typename c1<traits<int>::next>::c2<void>();
}

g++ -v recursivetemplate2.cpp -W -Wall
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
Configured with: ../gcc/configure --enable-shared --disable-nls --enable-threads=posix --enable-clocale=gnu --enable-languages=c,c++,f77,objc
Thread model: posix
gcc version 3.1 20011125 (experimental)
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/cc1plus -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -W -Wall -D_GNU_SOURCE -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ recursivetemplate2.cpp -D__GNUG__=3 -D__DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -quiet -dumpbase recursivetemplate2.cpp -W -Wall -version -o /tmp/ccbhQsLM.s
GNU CPP version 3.1 20011125 (experimental) (cpplib) (i386 Linux/ELF)
GNU C++ version 3.1 20011125 (experimental) (i686-pc-linux-gnu)
	compiled by GNU C version 3.1 20011125 (experimental).
ignoring nonexistent directory "NONE/include"
ignoring nonexistent directory "/usr/local/i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include/g++-v3
 /usr/local/include/g++-v3/i686-pc-linux-gnu
 /usr/local/include/g++-v3/backward
 /usr/local/include
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/include
 /usr/include
End of search list.
recursivetemplate2.cpp: In function `int main()':
recursivetemplate2.cpp:38: using `typename' outside of template

g++ -v recursivetemplate2.cpp -W -Wall -pedantic
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
Configured with: ../gcc/configure --enable-shared --disable-nls --enable-threads=posix --enable-clocale=gnu --enable-languages=c,c++,f77,objc
Thread model: posix
gcc version 3.1 20011125 (experimental)
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/cc1plus -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -W -Wall -pedantic -D_GNU_SOURCE -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ recursivetemplate2.cpp -D__GNUG__=3 -D__DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -quiet -dumpbase recursivetemplate2.cpp -W -Wall -pedantic -version -o /tmp/ccaC7nle.s
GNU CPP version 3.1 20011125 (experimental) (cpplib) (i386 Linux/ELF)
GNU C++ version 3.1 20011125 (experimental) (i686-pc-linux-gnu)
	compiled by GNU C version 3.1 20011125 (experimental).
ignoring nonexistent directory "NONE/include"
ignoring nonexistent directory "/usr/local/i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include/g++-v3
 /usr/local/include/g++-v3/i686-pc-linux-gnu
 /usr/local/include/g++-v3/backward
 /usr/local/include
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/include
 /usr/include
End of search list.
recursivetemplate2.cpp: In function `int main()':
recursivetemplate2.cpp:38: warning: using `typename' outside of template
 as -V -Qy -o /tmp/ccm2bFUd.o /tmp/ccaC7nle.s
GNU assembler version 2.11.90.0.29 (i486-suse-linux) using BFD version 2.11.90.0.29
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/collect2 -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 /usr/lib/crt1.o /usr/lib/crti.o /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/crtbegin.o -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1 -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/../../.. /tmp/ccm2bFUd.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/crtend.o /usr/lib/crtn.o

./a.out
void foo() [with _T = int]
c1<_T>::c1() [with _T = long int]
c1<_T>::c1() [with _T = long int]

Thank you.

Peter Schmid


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