gcc 4.9.3: typedef referenced in a friend template function

[Francis ANDRE <francis.andre.kampbell@xxxxxxxxx>]

Hello

gcc 4.9 complains on the following line marked <<<

        template<typename stream, int size>
        DTT_API_SCOPE stream& operator<<(stream& os, const 
Alphabetic<size>& a) {
            os << static_cast<const Alphabetic<size>::DataType&>(a);    
        // <<<
            return os;
        }

with this error
/cygdrive/z/git/ISO-8583/cpp/code/ISO-8583/DTT/Alphabetic.cpp:74:28: 
attention : ISO C++ forbids declaration of ‘type name’ with no type 
[-fpermissive]
    os << static_cast<const Alphabetic<size>::DataType&>(a);


What is the meaning of: ISO C++ forbids declaration of ‘type name’ with 
no type?

1/Here an snippet of Alphabetic

        template<int sizeb>
        class DTT_API_SCOPE Alphabetic : public Bytes < sizeb, ' ' > {
        public:
            typedef Bytes <sizeb, ' ' > DataType;

        public:

            template<typename stream, int size>
            friend DTT_API_SCOPE stream& operator>>(stream& is, 
Alphabetic<size>& a);
            template<typename stream, int size>
            friend DTT_API_SCOPE stream& operator<<(stream& os, const 
Alphabetic<size>& a);
           };

Below the log:

g++ -O0 -g3 -std=c++11 -Wno-non-template-friend -Wno-cpp 
-fmessage-length=0 -fpermissive -D_GLIBCXX_USE_C99 -DVRM_ISO_8583=1987 
-D_DEBUG  -I/cygdrive/z/git/ISO-8583/cpp/inc -I"/cygdrive/z/git/pocozos" 
-I"/cygdrive/z/git/pocozos/NetSSL_Win/include" 
-I"/cygdrive/z/git/pocozos/Net/include" 
-I"/cygdrive/z/git/pocozos/XML/include" 
-I"/cygdrive/z/git/pocozos/Util/include" 
-I"/cygdrive/z/git/pocozos/Foundation/include" 
-I"/cygdrive/z/git/pocozos/CppUnit/include"  -c -o 
/cygdrive/z/git/ISO-8583/cpp/make/obj/Cygwin/i686/ISO-8583/DTT/Alphabetic.o 
-MMD -MP 
-MF"/cygdrive/z/git/ISO-8583/cpp/make/obj/Cygwin/i686/ISO-8583/DTT/Alphabetic.d" 
/cygdrive/z/git/ISO-8583/cpp/code/ISO-8583/DTT/Alphabetic.cpp
/cygdrive/z/git/ISO-8583/cpp/code/ISO-8583/DTT/Alphabetic.cpp: In 
function ‘stream& ISO_8583::DTT::operator<<(stream&, const 
ISO_8583::DTT::Alphabetic<size>&)’:
/cygdrive/z/git/ISO-8583/cpp/code/ISO-8583/DTT/Alphabetic.cpp:74:28: 
attention : ISO C++ forbids declaration of ‘type name’ with no type 
[-fpermissive]
    os << static_cast<const Alphabetic<size>::DataType&>(a);
                            ^
/cygdrive/z/git/ISO-8583/cpp/code/ISO-8583/DTT/Alphabetic.cpp:74:28: 
erreur: expected ‘>’
/cygdrive/z/git/ISO-8583/cpp/code/ISO-8583/DTT/Alphabetic.cpp:74:28: 
erreur: expected ‘(’
/cygdrive/z/git/ISO-8583/cpp/code/ISO-8583/DTT/Alphabetic.cpp:74:55: 
erreur: expected primary-expression before ‘>’ token
    os << static_cast<const Alphabetic<size>::DataType&>(a);
                                                       ^
/cygdrive/z/git/ISO-8583/cpp/code/ISO-8583/DTT/Alphabetic.cpp:74:59: 
erreur: expected ‘)’ before ‘;’ token
    os << static_cast<const Alphabetic<size>::DataType&>(a);
                                                           ^
/cygdrive/z/git/ISO-8583/cpp/code/ISO-8583/DTT/Alphabetic.cpp: In 
instantiation of ‘stream& ISO_8583::DTT::operator<<(stream&, const 
ISO_8583::DTT::Alphabetic<size>&) [with stream = 
ISO_8583::DTT::BinaryOutputStream; int size = 2]’:


$ gcc -v
Utilisation des specs internes.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-pc-cygwin/4.9.3/lto-wrapper.exe
Target: i686-pc-cygwin
Configuré avec: 
/cygdrive/i/szsz/tmpp/gcc/gcc-4.9.3-1.i686/src/gcc-4.9.3/configure 
--srcdir=/cygdrive/i/szsz/tmpp/gcc/gcc-4.9.3-1.i686/src/gcc-4.9.3 
--prefix=/usr --exec-prefix=/usr --localstatedir=/var --sysconfdir=/etc 
--docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C 
--build=i686-pc-cygwin --host=i686-pc-cygwin --target=i686-pc-cygwin 
--without-libiconv-prefix --without-libintl-prefix --libexecdir=/usr/lib 
--enable-shared --enable-shared-libgcc --enable-static 
--enable-version-specific-runtime-libs --enable-bootstrap 
--enable-__cxa_atexit --with-dwarf2 --with-arch=i686 --with-tune=generic 
--disable-sjlj-exceptions 
--enable-languages=ada,c,c++,fortran,java,lto,objc,obj-c++ 
--enable-graphite --enable-threads=posix --enable-libatomic 
--enable-libgomp --disable-libitm --enable-libquadmath 
--enable-libquadmath-support --enable-libssp --enable-libada 
--enable-libjava --enable-libgcj-sublibs --disable-java-awt 
--disable-symvers --with-ecj-jar=/usr/share/java/ecj.jar --with-gnu-ld 
--with-gnu-as --with-cloog-include=/usr/include/cloog-isl 
--without-libiconv-prefix --without-libintl-prefix --with-system-zlib 
--enable-linker-build-id
Modèle de thread: posix
gcc version 4.9.3 (GCC)