How Can I Properly Store Arrays Within Vectors in C ?

Vector of Arrays: Handling Arrays within Containers

Working with vectors of arrays requires attention to certain nuances. In particular, errors can arise when attempting to resize a vector of arrays. To understand the issue and find a viable solution, let's delve deeper into the details.

Background: Arrays and Containers

Arrays are data structures that hold contiguous memory locations for storing elements of the same type. However, containers like vectors, which are used to store collections of data, have a more general purpose. They can hold objects of different types, including pointers and classes.

Error Cause: Non-Scalar Element Type

The error you encountered, "conversion from 'int' to non-scalar type 'float [4]' requested," stems from the fact that arrays are considered non-scalar types. Scalar types refer to basic data types like integers, floating-point numbers, and characters. Non-scalar types, on the other hand, include arrays, structs, and classes.

Correct Approach: Array Class Templates

To resolve the issue, you cannot store arrays directly in a vector. Instead, you can use an array class template. Array class templates are defined libraries like Boost, TR1, and C 0x, and they provide a convenient way to work with arrays within containers.

Example: Using the std::array Class Template

The std::array class template is a suitable choice. Here's an example of how to declare a vector of arrays using it:

This code defines a vector of arrays. Each array in the vector will have four double-precision floating-point elements. By using the std::array class template, you avoid the issues associated with storing arrays directly in the vector.

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