GCC compilation error for template template parameters

Adam Badura <abadura@o2.pl>
Wed, 6 Feb 2008 20:13:12 CST
Following simple code:


template< template< typename > class T1 >
struct OuterType
    template< typename T2 >
    struct InnerType {};

template< template< typename > class T >
struct TestType : public OuterType< OuterType< T >::InnerType > {};


while being compiled with GCC 3.4.4 (Windows, Cygwin) with no compiler
options produces following error:


gpp.cpp:10: error: type/value mismatch at argument 1 in template
parameter list for `template<template<class> class T1> struct
gpp.cpp:10: error: expected a class template, got


MS VS 2008 for the same code does not generate any error (nor

Adding "typename" before "OuterType< T >::InnerType" does not change
anything (on both compilers) and seems wrong to me anyway.

Whats wrong with that code? Or is it a bug in GCC?

Adam Badura

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