Linker error from not declaring abstract method in abstract base class?

链接错误不能声明抽象方法的抽象基类？

youdao

Abstract: According to the excessive error factors and difficult analysis of the binocular vision measurement systems, an error analysis method based on grey incidence technology was proposed.

摘要：针对双目视觉测量系统存在误差因素繁多、分析困难等问题，提出了一种基于灰色关联技术的误差分析方法。

youdao

Abstract: According to the excessive error factors and difficult analysis of the binocular vision measurement systems, an error analysis method based on grey incidence technology was proposed.

摘要：针对双目视觉测量系统存在误差因素繁多、分析困难等问题，提出了一种基于灰色关联技术的误差分析方法。

youdao