Last week, C++26 was finalized in Sofia, Bulgaria — and C++26 will include all of the reflection papers that we were pushing for:

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C++26 introduces powerful reflection capabilities that enable compile-time JSON parsing and automatic C++ struct generation. The post demonstrates how to use the new reflection API to read JSON files at compile time and create corresponding C++ objects with matching structure and values. Key features include data_member_spec for defining struct members, substitute for template instantiation, and reflect_constant for compile-time value handling. The implementation recursively processes JSON objects, strings, and numbers to generate type-safe C++ structs with external linkage.

Reflecting JSON into C++ Objects