How do I get the length of multidimensional structured arrays?
I have a class that receives a 3D array of a struct in a constructor. Further calculations also require the length of each measurement.
short example:
MyStruct*** mySt;
mySt = new MyStruct**[5]
mySt[0] = new MyStruct*[4]
mySt[0][0] = new MyStruct[3]
How can I return these values (5, 4, 3) so that I can store them in a new class without explicitly sending them to the constructor?
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1 answer
You cannot get sizes from simple C ++ arrays allocated with new
and stored as pointers: there is no language construct that allows you to get the size of an array.
There are two options for solving this problem:
- In C ++, use a container that supports size - like
std::vector
vectors vectors, or - In C (or C ++ if you prefer to stay with arrays), create a separate 3-D array of dimensions and pass it along with the array
mySt
.
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