C++ C++；自动推断在类构造函数中不起作用

我有两门课：

class string_keys_management {
public:
    string_keys_management(const string_keys_management&) = default;
    string_keys_management(string_keys_management&&) = default;
    string_keys_management& operator=(const string_keys_management&) = default;
    string_keys_management& operator=(string_keys_management&&) = default;
    string_keys_management(const std::initializer_list<std::string>& keys, const std::string &description = "") : keys(keys), description(description) {}
    bool operator==(const std::string &ref) { /*...*/ }
    bool operator!=(const std::string &ref) { /*...*/ }
    bool operator<(const string_keys_management &ref) const { /*...*/ }

private:
    std::vector<std::string> keys;
    std::string description;
};

template <typename V>
class multimap {
public:
    multimap(const std::map<string_keys_management, V> &ref) : values(ref) {}
    multimap& operator=(const std::map<string_keys_management, V> &ref) { values = ref; }
    V& at(const std::string &key) { return values.at(key); }
    void insert(const string_keys_management &keys, V val) { values.insert({keys, val}); }

private:
    std::map<string_keys_management, V> values;
};

最短的工作方式是：

multimap<std::string> mp = std::map<string_keys_management, std::string>{
        {{{"key1", "key2", "key3"}, "description1"}, "value"},
        {{{"key4", "key5", "key6"}, "description1"}, "value2"}
};

multimap mp=std:：map{
{{{“key1”，“key2”，“key3”}，“description1”}，“value”}，
{{{“key4”、“key5”、“key6”}，“description1”}，“value2”}
};

编译器：G++-10.2c++20

这是预期的方式，还是编译器问题？

---

如果它按预期的方式执行，则哪个规则支持它？

您缺少一对括号：

multimap mp={{
{{{“key1”，“key2”，“key3”}，“description1”}，“value”}，
{{{“key4”、“key5”、“key6”}，“description1”}，“value2”}
}};

您又少了一对括号：

multimap mp={{
{{{“key1”，“key2”，“key3”}，“description1”}，“value”}，
{{{“key4”、“key5”、“key6”}，“description1”}，“value2”}
}};

multimap<std::string> mp = std::map<string_keys_management, std::string>{
        {{{"key1", "key2", "key3"}, "description1"}, "value"},
        {{{"key4", "key5", "key6"}, "description1"}, "value2"}
};