yomm2

yorel::yomm2::error
yorel::yomm2::error_type
yorel::yomm2::error_handler_type
yorel::yomm2::unknown_class_error
yorel::yomm2::hash_search_error
yorel::yomm2::method_table_error
yorel::yomm2::resolution_error
_{defined in <yorel/yomm2/core.hpp>, also provided by <yorel/yomm2/keywords.hpp>}

struct error {
};

struct unknown_class_error : error {
    enum { update = 1, call } context;
    type_id type;
};

struct hash_search_error : error {
    size_t attempts;
    size_t buckets;
};

struct method_table_error : error {
    type_id type;
};

struct resolution_error : error {
    enum status_type { no_definition = 1, ambiguous } status;
    std::string_view method_name;
    size_t arity;
    static constexpr size_t max_types = 16;
    type_id types[max_types];
};

using error_type = std::variant<
    resolution_error,
    unknown_class_error,
    hash_search_error,
    method_table_error
>;


using error_handler_type = void (*)(const error_type& error);

Classes derived from error are used to describe various error conditions.

Name	Description
unknown_class_error	class has not been registered
hash_search_error	hash function not found
method_table_error	wrong class for virtual_ptr::final
resolution_error	method call is undefined or ambiguous

unknown_class_error

YOMM2 detected that a class used in a method declaration or definition, or a method call, was not registered via use_classes or register_classes.

Member variable	Description
enum { update = 1, call } context	where the error was detected (during update or during a method call )
type_id type	type id of the class

hash_search_error

Random search failed to find the parameters of the hash function.

Member variable	Description
size_t attempts	how many attempts were made during random search
size_t buckets	maximum number of buckets tried

method_table_error

The class passed to virtual_ptr::final is not the same as the object’s actual class.

Member variable	Description
type_id type	type id of the class

resolution_error

A single applicable definition could not be found for a method call.

Member variable	Description
status_type status	no_definition, ambiguous
std::string_view method_name	a the method name
size_t arity	number of virtual parameters, and size of types
size_t max_types	the maximum number of type ids in types
const type_id* types	the type ids of the virtual arguments (up to max_types)

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