ES.105: Don't divide by zero
ES.105:避免被0除
Reason（原因）
The result is undefined and probably a crash.
结果无定义，很可能会导致程序崩溃。
Note（注意）
This also applies to %.
本规则也适用于取余运算。
Example, bad（反面示例）
代码语言：javascript复制double divide(int a, int b)
{
// BAD, should be checked (e.g., in a precondition)
return a / b;
}
Example, good（范例）
代码语言：javascript复制double divide(int a, int b)
{
// good, address via precondition (and replace with contracts once C gets them)
Expects(b != 0);
return a / b;
}
double divide(int a, int b)
{
// good, address via check
return b ? a / b : quiet_NaN<double>();
}
Alternative: For critical applications that can afford some overhead, use a range-checked integer and/or floating-point type.
可选项：对于能够承受一定代价的要求严格的应用，可以考虑使用带有范围检查的整数或者浮点数。
Enforcement（实施建议）
- Flag division by an integral value that could be zero
- 标记可能为零的整数除数。
原文链接 https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#es105-dont-divide-by-zero
