value = sizeof(v) == 1
? static_cast<uint8>(v)
: sizeof(v) == 2 ? static_cast<uint16>(v)
: sizeof(v) == 4 ? static_cast<uint32>(v)
: static_cast<uint64>(v);
链式三元运算符
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转载自blog.csdn.net/shujianlove0/article/details/84564363
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