为什么 BigInt、BigNum 或任意精度算术不存在于 STL 或 C++ 标准库中？
Is there a specific reason for this?
Was it a design decision?
Big number in C++ along with other search results show classes written to account for this.
I wonder if the future version would include this feature.
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C++11 至少有两个大整数提案（n1718、n1744、n2143）。全部被拒绝。这就是为什么您在标准库中看不到它们
来自 http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1954.html：
拒绝 n1718 和 n2143：http://www .open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2870.html （只是一个表格，这里没有给出原因）
There were at least two big integer proposals to C++11 (n1718, n1744, n2143). All are rejected. Which is why you don't see them in the standard library
From http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1954.html:
Rejection of n1718 and n2143: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2870.html (just a table, no reason given here)