Create a fixed size std::vector and write to the elements

Question

In C++ I wish to allocate a fixed-size (but size determined at runtime) std::vector then write to the elements in this vector. This is the code I am using:

int b         


        

Answer 1

The actual error is because you declare the vector to be constant, meaning you can never change the contents.

Then when you try to get a non-constant reference to an entry in the vector, the compiler tells you that you can't do that, because then you could change the constant value stored in the vector.

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As for creating a vector with a size that can be fixed at runtime, but not change size after the vector has been created, then you have to create a container adaptor. Basically you have to create a wrapper around another container, just like e.g. std::stack does.