c++ - Knowing the type of the template outside the class -

to make clear, want imitate behaviour of value_type member of std::vector.

for example:

template <class t> class foo{     //some declaration , definition value_type };  int main(){     foo<int> bar;     bar::value_type x=5; //x int }

how can implement it?

try:

template <class t> class foo { public:     typedef t value_type; };

btw: bar::value_type invalid, should use as:

foo<int>::value_type x = 5; //x int

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