问题描述
浏览这个 C++ BigInt 库并找到 BigInt.cpp 文件.顶部有一条关于兼容性的评论:
Looking through this C++ BigInt library and found the BigInt.cpp file. At the top there is a a comment at the top about compatibility:
这个类是为 g++ 编译器编写的，并使用了一些 g++ 扩展(如long double"和 ">?=" 运算符).
This class was written for the g++ compiler and uses some of the g++ extensions (like "long double" and the ">?=" operator).
>?= 运算符是做什么的?我在其他任何地方都找不到对它的引用.
What does that >?= operator do? I can't find a reference to it anywhere else.
推荐答案
这是一个 GCC 扩展，在 GCC 4.2 及更高版本中被删除.
It's a GCC extension that was removed in GCC version 4.2 and later.
a >?= b 的等价物是 a = max(a,b);
还有一个非常相似的运算符a <?= b，意思和a = min(a, b);一样.
There is also a very similar operator a <?= b which means the same as a = min(a, b);.
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