accept()

static constexpr bool rbr::as_keyword< typed_keyword< ID, Type > >::accept ( )

inlinestaticconstexprinherited

Compile-time validation of value.

When a value is bound to a Keyword to form an Option, one can validate this binding by checking arbitrary properties on the value type. This is done by the accept() member.

If Keyword defines a check static template member function, it will be called to provide the return value of accept(). Otherwise, true is returned, thus automatically validating any value type.

Template Parameters

T	Type to validate

Returns

true if T is accepted by current keyword, false otherwise.

Example:

#include <raberu/raberu.hpp>
 
// Defines a keyword type that only accept floating point value
struct real_keyword : rbr::as_keyword<real_keyword>
{
  template<typename T>  static constexpr bool check() { return std::is_floating_point_v<T>; }
  using rbr::as_keyword<real_keyword>::operator=;
};
 
inline constexpr real_keyword real = {};