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hw03 #25

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@adelacvg adelacvg commented Jan 6, 2022

主要难点在于d+c+e,需要分类讨论重载不同的情况,为了减少重载个数用了sfinae技术,使用enable_if_t,为了防止与之后的偏特化冲突把默认返回的void改成bool然后赋值为true。重载<<运算符不知道为什么无法像重载+一样直接return,必须单独return os,会报错无法复制os,但按理说都应该是引用才对。编译使用的版本是g++ 11.2,重载输出尝试使用c++20的ranges库,但是改了cmakelist的cXX为20还是会报错,不知道为什么还不支持。

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