c++ - 在 C++11 中初始化 vector 的 vector

Question

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Answer 1

我同意 Kerrek SB 的回答，它解决了手头的问题。我认为您可能想更进一步，制作结构的 training_data 变量 vector ，而不是字符串 vector 的 vector 。

enum class CreditRating { FAIR, GOOD, EXCELLENT };
enum class Age { YOUNG, MIDDLE, OLD };

// Make plain-old-data, so that you can initialize using aggregate initialization
struct Applicant 
{
  Age age;
  bool has_job;
  bool owns_house;
  CreditRating credit_rating;
};

const std::vector<Applicant> training_data{
        { Age::YOUNG, false, false, CreditRating::FAIR },
        { Age::YOUNG, false, false, CreditRating::GOOD },
        // [...]
        {   Age::OLD, false,  true, CreditRating::GOOD } };

// Use training_data