C++ Unordered_Map: Receiving "error: expected unqualified-id before ‘[’ token" at Compile

Question

I have an unordered_map (in C++) that pairs an int with an object of class Item. I initialize my unordered map at the beginning of the file as such:

#include <iostream>
#include <unordered_map>
using namespace std;
typedef std::unordered_map<int, Item> MyList;

From then on, whenever I try to use MyList, such as in:

Item item1;
MyList[12] = item1;

I receive an error at said line: "error: expected unqualified-id before ‘[’ token" when I compile in the terminal. Any ideas what could be wrong? Below is an other example of how I use it and receive the same or similar error.

void itemManager::removeItem(int x)  {
    MyList.erase(x);
}

Yields: "error: expected primary-expression before ‘.’ token"

Please and thanks for the help.

MyList[12] is equivalent to saying std::unordered_map<int, Item>[12]. — Jesse Good
– Jesse Good, Commented Jun 29, 2012 at 5:48

Vaughn Cato · Accepted Answer · 2012-06-29 05:46:18Z

3

MyList is a type:

typedef std::unordered_map<int, Item> MyList;

but you are using it like an object:

MyList[12] = item1;

Perhaps putting the typedef in there was the mistake.

answered Jun 29, 2012 at 5:46

Vaughn Cato

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