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#include <functional>
#include <vector>
 
using namespace std;
struct MultiMemoizator {
    template <typename ReturnType, typename... Args>
    ReturnType callFunction(std::function<ReturnType(Args...)> memFunc, Args&&... args) {
 
    }
};
 
typedef vector<double> vecD;
 
vecD sort_vec (vecD const& vec) {
    return vec;
}
 
int main()
{
    vecD vec;
    std::function<vecD(vecD)> sortFunc(sort_vec);
    MultiMemoizator mem;
    mem.callFunction<vecD, vecD>(sortFunc, vec);
}
 

prog.cpp: In function 'int main()':
prog.cpp:23:47: error: no matching function for call to 'MultiMemoizator::callFunction(std::function<std::vector<double>(std::vector<double>)>&, vecD&)'
     mem.callFunction<vecD, vecD>(sortFunc, vec);
                                               ^
prog.cpp:7:16: note: candidate: template<class ReturnType, class ... Args> ReturnType MultiMemoizator::callFunction(std::function<_Res(_ArgTypes ...)>, Args&& ...)
     ReturnType callFunction(std::function<ReturnType(Args...)> memFunc, Args&&... args) {
                ^
prog.cpp:7:16: note:   template argument deduction/substitution failed:
prog.cpp:23:47: note:   cannot convert 'vec' (type 'vecD {aka std::vector<double>}') to type 'std::vector<double>&&'
     mem.callFunction<vecD, vecD>(sortFunc, vec);
                                               ^

Standard output is empty