我试图获取模板挂,并具有以下代码:模板参数无效
town.h
#ifndef TOWN_H
#define TOWN_H
namespace segregation {
template <typename Pos, typename Resident, template <typename> class Container>
class Town {
public:
Town();
virtual ~Town();
virtual Resident getResident(Pos address);
virtual void move(const Pos& from, const Pos& to);
virtual Container<Resident> getNeighbours(const Pos address);
};
}
#endif /* TOWN_H */
和
flat_town.h
#ifndef FLAT_TOWN_H
#define FLAT_TOWN_H
#include "town.h"
#include <array>
#include <forward_list>
#include <utility>
namespace segregation {
template<int x, int y, class R>
using TownMap = std::array<std::array<R, y>, x>;
template <typename R>
using Neighbourhood = std::forward_list<R>;
using Pos = std::pair<int, int>;
template <int x, int y, class Resident>
class FlatTown: public Town<Pos, Resident, Neighbourhood<typename Resident>> {
private:
TownMap<x, y, Resident> m_townMap;
int m_neighbourhood_size;
public:
FlatTown(TownMap<x, y, Resident> t_townMap, int t_neighbourhood_size) :
m_townMap(t_townMap), m_neighbourhood_size(t_neighbourhood_size) {};
Resident getResident(const Pos & address);
void move(const Pos & from, const Pos & to);
Neighbourhood<Resident> getNeighbours(const Pos & address);
virtual ~FlatTown();
};
}
#endif /* FLAT_TOWN_H */
我目前还没有一个IDE,所以我通过运行
$ g++ flat_town.h
产生以下错误验证正确性:
flat_town.h:18:76: error: template argument 1 is invalid
class FlatTown: public Town<Pos, Resident, Neighbourhood<typename Resident>> {
^~
flat_town.h:18:45: error: template argument 3 is invalid
class FlatTown: public Town<Pos, Resident, Neighbourhood<typename Resident>> {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
我觉得这些更高级的模板非常不确定和所有帮助表示赞赏。
问候,托比亚斯
我对编译头文件的原因更感兴趣吗?为什么不包含*头文件的源文件? –
您应该也许应该阅读[为什么模板只能在头文件中实现?](https://stackoverflow.com/questions/495021/why-can-templates-only-be-implemented-in-the-header-文件) –
@Someprogrammerdude从某种意义上说,它是获得最小样本的自然方式(它只是斩断一个不必要的'#include“flat_town.h”':) :) – sehe