是什么让这个"宣告者无效"？C++

Question

我在vertex.h中有Vertex模板.从我的graph.h:

20 template<class edgeDecor, class vertexDecor, bool dir>
21 class Vertex;

我在我的Graph模板中使用它.

我已经在我的Graph中成功使用了Vertex模板,返回指向Vertices的指针等.现在我第一次尝试声明并实例化一个Vertex对象,而gcc告诉我我的'声明符'是'无效'.怎么会这样？

81 template<class edgeDecor, class vertexDecor, bool dir>
82 Graph<edgeDecor,int,dir> Graph<edgeDecor,vertexDecor,dir>::Dijkstra(vertex s, bool print = false) const
83 {
84    /* Construct new Graph with apropriate decorators */
85    Graph<edgeDecor,int,dir> span = new Graph<edgeDecor,int,dir>();
86    span.E.reserve(this->E.size());
87
88    typename Vertex<edgeDecor,int,dir> v = new Vertex(INT_MAX);
89    span.V = new vector<Vertex<edgeDecor,int,dir> >(this->V.size,v);
90 };

而且gcc说:

graph.h: In member function ‘Graph<edgeDecor, int, dir> Graph<edgeDecor, vertexDecor, dir>::Dijkstra(Vertex<edgeDecor, vertexDecor, dir>, bool) const’:
graph.h:88: error: invalid declarator before ‘v’
graph.h:89: error: ‘v’ was not declared in this scope

我知道这可能是另一个noob问题,但我会感激任何帮助.

Answer 1

伊戈尔是对的。至于下面的错误：

\n\n

graph.h:88: error: expected type-specifier before \xe2\x80\x98Vertex\xe2\x80\x99 \n

\n\n

...你可能需要说：

\n\n

Vertex<edgeDecor,int,dir> v = new Vertex<edgeDecor,int,dir>(INT_MAX);\n

\n