两阶段查找 - 需要解释

2021-12-13 00:00:00 templates c++

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?

推荐答案

模板编译(至少)两次:

Templates are compiled (atleast) twice:

  1. 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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