Re: std::map element in heap or stack?
shuisheng wrote:
I am wondering the inserted element in std::map is located in heap or
stack? For example
std::map<int, double> a;
a[0] = 3.14;
Since you can insert elements into the container at runtime, either it
stores them internally (which could store them on the "stack") or
externally (i.e. on the heap).
If it was internally, you would have to resize the object dynamically, but
C++ objects always have a fixed size. Alternatively, you could
allocate "enough" spare memory for internal storage (a fixed-capacity
container), but that isn't really useful.
The only other possibility is to use the heap, which is what is used.
The element of the map: pair<int, double>(0, 3.14) [...]
Danger: The element type for a map<int, double> is pair<int const, double>!
Uli
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