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In this course, you will learn about the C++ keyword const and its behaviour under different usage conditions, including local, global and static contexts. This course will help you to understand const and its implications when you attempt to return pointers and references in C++. By the end of the course, you will have a solid grip on const and its usage in preventing any accidental change of data.

Secure Coding Practices in C++: A Deep Dive into const

## Explanation
The following changes were applied:

* We turned `StringVectorHolder::print` into a `const` function
* We gave `StringVectorHolder::operator[]` a `const` overload
  * It still invoked a compiler error as the return type was a non-`const&` that discarded the `const` qualifier, so we turned the return type into a `const&`.


# Explanation
The following changes were applied:

* We turned `StringVectorHolder::print` into a `const` function
* We gave `StringVectorHolder::operator[]` a `const` overload
  * It still invoked a compiler error as the return type was a non-`const&` that discarded the `const` qualifier, so we turned the return type into a `const&`.


Here is the solution to the problem in the previous lesson.

Introduction

Arguments using const

Local Variables

Local Members

Functions

Return Types

const Parameters

const and Smart Pointers

Rvalue References

Summary

Solution

Explanation