c++ - Error when using template class as template template-parameter in member variable -

i using templates in c++ project, , i'm having issue when using templated type template template-parameter. think best way describe give example produces error:

template <template<class> class p, typename t> class foo {     p<t> baz; };  template <class t> class bar {     foo<bar, t> memberfoo;      void makefoo() {         foo<bar, t>* f = new foo<bar, t>();     } };  foo<bar, int> globalfoo; 

the declaration of globalfoo causes no error, declarations of memberfoo , f cause compiler error:

error: template argument template template parameter must class template or type alias template

the error occurs when using bar template parameter inside of declaration of bar class, occurs using both clang , g++. seems documented somewhere, googling yields no questions or other documentation.

is use of templates not legal in c++, or misunderstanding how define , use templates? if design architecture not allowed c++11 standard, workaround can use?

the issue incomplete type yielded @ time of instantiation. clang , g++ yield different errors because clang (apparently) doesn't implement c++11 rule injected class name can refer class template when used template template parameter (igor's suggestion doesn't work btw.) changing bar ::bar fixes error, makes clang point out incomplete error g++ does. changing baz p<t>* allows compile.

n.b. though compiles, undefined behavior. suggest redesigning classes.