Custom exception handling relies on building a hierarchical class structure of error types, all inheriting from a single domain-specific base exception, which itself inherits from the language's built-in exception class so it remains part of the native exception framework. This hierarchy allows callers to catch errors at varying levels of specificity: broad catches on the domain base class, or narrow catches on specific error subtypes, with each subtype able to carry contextual data describing the failure. The concept belongs to software engineering / API design, specifically error-handling architecture, and relates to the broader principle of fail-fast design, in which errors are raised and surfaced as early as possible to prevent cascading failures.
Custom exception handling relies on building a hierarchical class structure of error types, all inheriting from a single domain-specific base exception, which itself inherits from the language's buil…