编译器使用两阶段查找来编译模板类是什么意思?
What does it mean that compiler is using two phase lookup in order to compile template class?
模板编译(至少)两次:
Templates are compiled (atleast) twice:
如果没有实例化,则会检查模板代码本身的语法.
例如:任何语法错误,例如 ;
等.
在实例化时(当确切类型已知时),再次检查模板代码以确保所有调用对该特定类型有效.
例如:模板可能会依次调用该特定类型可能不存在的函数.
At the time of instantiation(when the exact type is known), the template code is checked again to ensure all calls are valid for that particular type.
Eg: The template might in turn call to functions which might not be present for that particular type.
这称为两阶段查找.
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