ultra::src::DataframeRow Concept Reference

#include <columns_info.h>

Concept definition

template<class R>
concept ultra::src::DataframeRow = 
  std::ranges::forward_range<R>
  && std::ranges::sized_range<R>
  && std::copyable<R>
  && (std::same_as<std::ranges::range_value_t<R>, value_t>
      || std::same_as<std::ranges::range_value_t<R>, std::string>)

Detailed Description

A single row of a generic dataframe.

A DataframeRow models one logical record of a dataframe. It must:

• be a forward_range (multi-pass iteration is required);
• be a sized_range (the number of columns must be known);
• be copyable (rows may be copied during inference);
• expose values of type value_t or std::string.

This concept deliberately does not require random access, allowing rows to be represented by lightweight views or containers.