stoi (): Performs input validation. It throws a std::invalid_argument exception if the input string is not a valid representation of an integer, or a std::out_of_range exception if the converted value exceeds the range of the target type.

The newer, std::stoi also works directly from std::string (so you don't have to litter your code with .c_str() calls) and optionally provides you the first unmatched character as an index via a size_t, rather than as a pointer.

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The problem with stoi is that it succeeds on "123abc", which means it's mostly useless unless you supply and check the ending-index parameter. This makes it even harder to use than strtol because you need to both check the end index, and catch the exception.

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std::stoi converts as much as possible, and only throws an exception if there is nothing to convert. However, std::stoi accepts a pointer parameter representing the start index, which is updated to the character that terminated conversion. See MSDN stoi docs here.

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The OP is asking "what is the actual code behind std::stoi", but stoi is only one example. i.e. How did you know that strtol is part of the implementation of std::stoi?

c++ #stoi函数 Code ... 编译器报错：21 31 [Error] 'stoi' was not declared in this scope 展开全部 写回答 好问题 提建议 关注问题 分享