C++实现的一个可以写递归lambda的Y函数

 #include  #include  #include  #include  using namespace std; template class YBuilder { private: function, TArgs...)> partialLambda; public: YBuilder(function, TArgs...)> _partialLambda) :partialLambda(_partialLambda) { } TResult operator()(TArgs ...args)const { return partialLambda( [this](TArgs ...args) { return this->operator()(args...); }, args...); } }; template struct PartialLambdaTypeRetriver { typedef void FunctionType; typedef void LambdaType; typedef void YBuilderType; }; template struct PartialLambdaTypeRetriver, TArgs...)> { typedef TResult FunctionType(TArgs...); typedef TResult LambdaType(function, TArgs...); typedef YBuilder YBuilderType; }; template struct PartialLambdaTypeRetriver, TArgs...)const> { typedef TResult FunctionType(TArgs...); typedef TResult LambdaType(function, TArgs...); typedef YBuilder YBuilderType; }; template function::FunctionType> Y(TLambda partialLambda) { return typename PartialLambdaTypeRetriver::YBuilderType(partialLambda); } int _tmain(int argc, _TCHAR* argv[]) { auto fib = Y([](function self, int index) { return index<2 ?1 :self(index-1)+self(index-2); }); for (int i < 10; i++) { cout << fib(i) " "; } endl; }< pre>