How Can You Specialize Templates Based on Overload Resolution?

Metaprogramming: Specialization Based on Overload Resolution

In metaprogramming, it's common to define templates based on type properties. However, a challenge arises when trying to select between two template definitions based on whether a specific overload is defined for a given type.

Walter Brown introduces a useful type, void_t, which returns void if no template arguments are provided. Building upon this concept, we can define a type trait to check for the existence of the std::to_string overload for a given type:

With this type trait, we can now easily write a template that specializes based on the overload resolution for std::to_string:

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