Function isLarge

sample/isLarge.cpp:4–13

#include <iostream>

constexpr bool isLarge(double value)
{
  using namespace matchit;
  return match(value)(
      // clang-format off
        pattern | app(_ * _, _ > 1000) = expr(true),
        pattern | _                    = expr(false)
      // clang-format on
  );
}

// app with projection returning scalar types is supported by constexpr match.
static_assert(isLarge(100));