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Support C++ template within template?

Eric Liang
Prodigy 140 points


Hi TI experts,

I am using CGT v7.3.4, and my code is like below:

 

template<typename TSrc>

funcA(vector<TSrc> *src)

{

vector<int>::iterator iit;

vector<TSrc>::iterator  sed = src ->end() - 1;

...

}

 

I know the first vector is support, but the second vector always gets an error while compile saying expected a ";". I wonder whether the compiler support this kind of embedded template, just like MicroSoft does.

Thanks.

  • 0
    TI__Guru* 84285 points

    Write it like this:

    template<typename TSrc>

    funcA(vector<TSrc> *src)

    {

    vector<int>::iterator iit;

    typename vector<TSrc>::iterator  sed = src ->end() - 1;

    ...

    }

  • 0 in reply to Archaeologist
    Prodigy 140 points

    It works. Thank you again.

  • 0 in reply to Eric Liang
    Prodigy 140 points

    what about another case below?

    template <typename RT>

    class Delegate<RT ()>

    {

    ...

    };

    template <typename RT>

    class Event<RT ()>

    {

    private:

    DelegateList m_list;

    typedef Delegate<RT ()> Delegate;

    typedef std::vector<Delegate*> DelegateList;

    ...

    public:

    Event& funcA(const Delegate& delegate)

    {

    DelegateList::iterator it = m_list.begin();

    ...

    }

    };

    ========================================

    compiler error, said: exected a ";"

    I tried to add "typename" before "DelegateList::iterator it = m_list.begin();", but didn't work.

    I also tried to modified the typedef statement "typedef std::vector<Delegate*> DelegateList;" to "typedef typename std::vector<Delegate*> DelegateList;", still didn't work.

    what should I do?

  • 0 in reply to Eric Liang
    TI__Guru* 84285 points

    When posting about an error message, please be sure to include the complete text, including the line number, so we can figure out what line it refers to.

    You're using the type DelegateList before you've typedefed it.  Move the declaration of m_list below the typedef for DelegateList.

    typedef Delegate<RT ()> Delegate;

typedef std::vector<Delegate*> DelegateList;

DelegateList m_list;

    You'll also need "typename" on the declaration of "it".

    typename DelegateList::iterator it = m_list.begin();