用于模板方法的模板专业化的C ++语法

Question

在C ++中使用模板的新知识。我想根据将单个对象指针传递给函数还是对象指针的std :: vector来创建类函数的模板专用化。我希望std :: vector通过引用传递。我不太清楚所需的语法：

StateEvolver.h

#ifndef STATEEVOLVER_H
#define STATEEVOLVER_H

#include "Vehicle.hh"

class stateevolver
{
public:
    stateevolver();
    template<typename T> void evolveState(T, double time);
};

// Template specialization declarations for functions using either std::vector<vehicle*> or single vehicle pointer

template<>
void stateevolver::evolveState<std::vector<vehicle*>&>(std::vector<vehicle*> & , double time);

template<>
void stateevolver::evolveState<vehicle*>(vehicle*, double time);


#endif

StateEvolver.cpp

template<>
void stateevolver::evolveState<std::vector<vehicle*>&>(std::vector<vehicle*> & vehicleVec, double time) {
}

我将其实例化到另一个文件中，如下所示：

MyStateEvolver.evolveState(vectorOfVehiclePointers, time); // COMPILE ERROR

并收到此编译时错误：

undefined reference to `void stateevolver::evolveState<std::vector<vehicle*, std::allocator<vehicle*> > >(std::vector<vehicle*, std::allocator<vehicle*> >, double)'

有什么想法我要去哪里吗？谢谢。