错误：'test'的外线定义与'B< dim>'中的任何声明都不匹配 [英] error: out-of-line definition of 'test' does not match any declaration in 'B<dim>'

问题描述

我有一个小问题就是杀了我!!我不知道下面的代码有什么问题。我应该能够实现从超类继承的函数，不应该吗？但我得到错误：'test'的外线定义与'B< dim>'中的任何声明都不匹配

I have a small problem that is killing me!! I don't know what seems to be wrong with the below code. I should be able to implement the function that is inherited from the super class, shouldn't I? but I get error: out-of-line definition of 'test' does not match any declaration in 'B<dim>'

template <int dim>
class A 
{
public:
  virtual double test() const ;
};

template <int dim>
class B : public A <dim>
{
};

template <int dim>
double B<dim>::test () const
{
  return 0;
}

我在使用clang（Apple LLVM 5.1版）的Mac上。

I am on a Mac using clang (Apple LLVM version 5.1).

推荐答案

尝试

template <int dim>
class B : public A <dim>
{
public:
     virtual double test () const;
};

// Function definition
template <int dim>
double B<dim>::test () const
{
  return 0;
}

您仍然需要定义声明的函数类声明。

You still need to define the function declared the class declaration.

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