contains()

template<concepts::option... Opts>

template<concepts::keyword Key>

static 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) );
}