contains()

template<concepts::option... Opts>

template<concepts::keyword Key>

constexpr auto rbr::settings< Opts >::contains ( Key const & kw )

inlinestaticconstexprnoexcept

Checks if a given rbr::keyword is stored inside rbr::settings.

Parameters

kw	Keyword to check

Returns

An instance of std::true_type if current setting contains an option based on kw. Otherwise, return an instance of std::false_type.

Example:

#include <raberu/raberu.hpp>
#include <iostream>
 
using namespace rbr::literals;
 
template<rbr::concepts::settings S> void check_contains(S const& s)
{
  if constexpr (S::contains("value"_kw)) std::cout << "Correct settings: " << s["value"_kw] << '\n';
  else std::cout << "Incorrect settings\n";
}
 
int main()
{
  check_contains(rbr::settings("value"_kw = 9));
  check_contains(rbr::settings("malus"_kw = 3.5));
  check_contains(rbr::settings("malus"_kw = 6.5, "value"_kw = 17));
}