Can I write C++ code without headers (repetitive function declarations)?

Use Lzz. It takes a single file and automatically creates a .h and .cpp for you with all the declarations/definitions in the right place.

Lzz is really very powerful, and handles 99% of full C++ syntax, including templates, specializations etc etc etc.

Update 150120:

Newer C++ ’11/14 syntax can only be used within Lzz function bodies.

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