Create a derived class inherited from the predefined grammar class.

创建一个从预定义grammar类继承而来的派生类。

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The result is still an AST, but the parent class does most of the work for you. My grammar class looks like this

结果还是 AST，但父类会为您执行大部分工作。

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The grammar class is a template class that is parameterized by its derived class DerivedT and the context class ContextT. The declaration for the grammar class is as follows.

grammar类是一个模板类，被其派生类DerivedT和上下文类ContextT参数化。

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In the 70s, I may have occasionally put gel upon my hair, smeared mascara upon my eyes and arranged a sneer upon my lip, but I was really a middle-class grammar school boy masquerading as part-time punk.

BBC: Should we despair at the kids of today?

And he said a "shockingly low" number of children from poor backgrounds were getting into grammar schools, while middle class children were being coached to pass the exam.

BBC: NEWS | UK | UK Politics | Tories 'out of touch' on grammars

David Willetts, the universities minister, argues that grammar schools entrench privilege because middle-class parents now prepare their children so well for the entrance exams that clever children who have not been coached do not pass.

ECONOMIST: Grammar schools