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Dr.Disrespect
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Joined: 17 Feb 2016
Posts: 526
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 Posted: Tue Aug 23, 2016 11:25 am Post subject: (C++) How to implement this data type? |
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In C++, I want to make an array-like data type which has each key(string) associated with several values. It's like a multi-dimensional array, but using strings as keys. How to do that?
I tried to use multimap. But I do not know how to access a specific value. For example:
| Code: |
std::multimap<std::string, int> test;
test.insert(std::pair<std::string, int>("Player1", 100));
test.insert(std::pair<std::string, int>("Player1", 200));
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I use the multimap to save each player's data, such as attack power, defense, etc. But how can I access, for example, the second value under the key "Player1"?
Thanks a lot.
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ParkourPenguin
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| Posted: Tue Aug 23, 2016 1:30 pm Post subject: |
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It's possible to iterate over a specific key using multimap::equal_range (reference & example); however, the values associated with a specific key have no more semantic value than what they already have on their own. In this case, you won't be able to discern a specific player's attack from their defense if you store them as basic integers under the key of the player's name.
Alternatively, using a map of structs or classes might be better.
| Code: | #include <iostream>
#include <map>
#include <string>
struct playerStats {
int attack;
int defense;
} player1, player2;
int main() {
player1.attack = 100;
player1.defense = 20;
player2.attack = 999;
player2.defense = 124;
std::map <std::string, playerStats* > players;
players["Steve"] = &player1;
players["Bob"] = &player2;
for (std::map<std::string, playerStats* >::iterator it = players.begin(); it != players.end(); it++) {
std::cout << it->first << ": \n\tAttack: " << it->second->attack << "\n\tDefense: " << it->second->defense << std::endl;
}
return 0;
} |
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Dr.Disrespect
Grandmaster Cheater
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Joined: 17 Feb 2016
Posts: 526
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| Posted: Tue Aug 23, 2016 3:34 pm Post subject: |
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| ParkourPenguin wrote: | It's possible to iterate over a specific key using multimap::equal_range (reference & example); however, the values associated with a specific key have no more semantic value than what they already have on their own. In this case, you won't be able to discern a specific player's attack from their defense if you store them as basic integers under the key of the player's name.
Alternatively, using a map of structs or classes might be better.
| Code: | #include <iostream>
#include <map>
#include <string>
struct playerStats {
int attack;
int defense;
} player1, player2;
int main() {
player1.attack = 100;
player1.defense = 20;
player2.attack = 999;
player2.defense = 124;
std::map <std::string, playerStats* > players;
players["Steve"] = &player1;
players["Bob"] = &player2;
for (std::map<std::string, playerStats* >::iterator it = players.begin(); it != players.end(); it++) {
std::cout << it->first << ": \n\tAttack: " << it->second->attack << "\n\tDefense: " << it->second->defense << std::endl;
}
return 0;
} |
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Thank you, Penguin. I have a follow up question:
| Code: |
struct playerStats {
int attack;
int defense;
} player1, player2;
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Are player1 and player2 inside the curly bracket or not? Are they memebers of the struct?
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Zanzer
I post too much
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Posts: 3278
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| Posted: Tue Aug 23, 2016 5:48 pm Post subject: |
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They are outside of the curly braces.
They are instances of the struct (variables).
The members are attack and defense.
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Dr.Disrespect
Grandmaster Cheater
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Joined: 17 Feb 2016
Posts: 526
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| Posted: Tue Aug 23, 2016 6:00 pm Post subject: |
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| Zanzer wrote: | They are outside of the curly braces.
They are instances of the struct (variables).
The members are attack and defense. |
Thanks, Zanzer. 
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