When should I use 'class' vs 'typename' for template parameters in C ?

Understanding the Use of 'class' and 'typename' for Template Parameters

One common question in C programming involves the choice between using 'class' or 'typename' as template parameters. While both options are functionally equivalent, this article aims to shed light on their respective nuances.

Originally, the keyword 'class' was utilized to define template parameters for types. However, to avoid syntactic ambiguities, the committee later introduced 'typename'. This new keyword was specifically designed to identify template types. However, for backward compatibility, 'class' retained its dual meaning.

Notably, in the case of template template parameters, 'class' was a necessity prior to C 17. However, the current recommendation is to use 'typename' exclusively for clarity and consistency.

Ultimately, the choice between 'class' and 'typename' comes down to personal preference. Some developers prefer to use 'typename' consistently to enhance readability, while others may opt to use 'class' solely due to historical familiarity. Regardless of the chosen keyword, both 'class' and 'typename' effectively serve their purpose as template parameters.

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