StateInfo 类型系统的 at 方法改为不存在则抛出 std::out_of_range 异常 #210
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具体内容
at
方法在访问不存在的类型时,会返回std::string
类型的"unknown"
,现改变这一行为,改为由 STL 自行抛出std::out_of_range
异常,同时返回类型更改为const std::string &
,与std::unordered_map
的at
方法行为一致