C ++ template set Template

1. The template class has members who are templates.

 
# Include <iostream> # include <typeinfo> using namespace STD; Template <class T> class Outer {public: Template <class r> class inner {public: void F () ;};}; template <class T> template <class r> void outer <t >:: inner <r >:f () {cout <"outer =" <typeid (t ). name () <Endl; cout <"inner =" <typeid (R ). name () <Endl; cout <"full inner =" <typeid (* This ). name () <Endl ;}int main () {outer <int >:: inne R <bool> Inner; Inner. F ();}/**////:~ // Output: // outer = int // inner = bool // full inner = Class outer <int> :: inner <bool> // press any key to continue...
 

2. template parameters

// A print function for Standard C ++ sequences # include <iostream> # include <list> # include <memory> # include <vector> # include <deque> using namespace STD; template <class T, template <Class U, class = Allocator <u> class seq> void printseq (SEQ <t> & SEQ) {for (typename seq <t> :: iterator B = seq. begin (); B! = Seq. end ();) cout <* B ++ <Endl ;}int main () {// process a vector <int> V; V. push_back (1); V. push_back (2); printseq (V); // process a list <int> lst; lst. push_back (3); lst. push_back (4); printseq (LST); // process a deque <int> D; D. push_back (5); D. push_back (6); printseq (d );}/**////:~
 

Note: typename notifies the compiler that the qualified identifier should be of type. Different from typedef, the new type is defined.

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