Maps can be used in C++ to store data in key, value pairs which can then be indexed by the key. Initialize a map as follows:
Here we have initialized a map to contain pairs of data where the key is an
and the value is a
bool. The container is defined with no size, similar to a vector
and we can add data as follows:
Any datatype can be used for either the key or the value, and the order of the data does not matter, so here we have added the key value 5 before the key value 1.
We can get data out of a map by providing a key value in the same manner as if it was a
vector. In this example we have our key values stored in a vector,
Keys and we can retrieve
the corresponding value for each key, regardless of the order of insertion or retrieval:
This is a very brief overview of how to get started with maps, for more detail check the docs.