| Home | Libraries | People | FAQ | More

## Class ctti_type_index

boost::typeindex::ctti_type_index

## Synopsis

    // In header: <boost/type_index/ctti_type_index.hpp>

    class ctti_type_index {
    public:
      // types
      typedef unspecified type_info_t;

      // construct/copy/destruct
      ctti_type_index() noexcept;
      ctti_type_index(const type_info_t &) noexcept;

      // private member functions
      std::size_t get_raw_name_length() const noexcept;

      // public member functions
      const type_info_t & type_info() const noexcept;
      const char * raw_name() const noexcept;
      std::string pretty_name() const;
      std::size_t hash_code() const noexcept;

      // public static functions
      template<typename T> static ctti_type_index type_id() noexcept;
      template<typename T> static ctti_type_index type_id_with_cvr() noexcept;
      template<typename T>
        static ctti_type_index type_id_runtime(const T &) noexcept;
    };

## Description

This class is a wrapper that pretends to work exactly like stl_type_index, but does not require RTTI support. For description of functions see type_index_facade.

This class produces slightly longer type names, so consider using stl_type_index in situations when typeid() is working.

### `ctti_type_index` public construct/copy/destruct

1.     ctti_type_index() noexcept;

2.     ctti_type_index(const type_info_t & data) noexcept;

### `ctti_type_index` private member functions

1.     std::size_t get_raw_name_length() const noexcept;

### `ctti_type_index` public member functions

1.     const type_info_t & type_info() const noexcept;

   Override: This function may be redefined in Derived class. Overrides must not throw.

   Returns: | Const reference to underlying low level type_info_t.

2.     const char * raw_name() const noexcept;

   Override: This function must be redefined in Derived class. Overrides must not throw.

   Returns: | Pointer to unredable/raw type name.

3.     std::string pretty_name() const;

   Override: This function may be redefined in Derived class. Overrides may throw.

   Returns: | Human readable type name. By default returns Derived::name().

4.     std::size_t hash_code() const noexcept;

   Override: This function may be redefined in Derived class. Overrides must not throw.

   | Note
   <boost/functional/hash.hpp> has to be included if this function is used.

   Returns: | Hash code of a type. By default hashes types by raw_name().

### `ctti_type_index` public static functions

1.     template<typename T> static ctti_type_index type_id() noexcept;

   This is a factory method that is used to create instances of Derived classes. boost::typeindex::type_id() will call this method, if Derived has same type as boost::typeindex::type_index.

   Override: This function may be redefined and made public in Derived class. Overrides must not throw. Overrides must remove const, volatile && and & modifiers from T.

   Template Parameters:

   `T` | Type for which type_index must be created.

   Returns: | type_index for type T.

2.     template<typename T> static ctti_type_index type_id_with_cvr() noexcept;

   This is a factory method that is used to create instances of Derived classes. boost::typeindex::type_id_with_cvr() will call this method, if Derived has same type as boost::typeindex::type_index.

   Override: This function may be redefined and made public in Derived class. Overrides must not throw. Overrides must not remove const, volatile && and & modifiers from T.

   Template Parameters:

   `T` | Type for which type_index must be created.

   Returns: | type_index for type T.

3.     template<typename T>
         static ctti_type_index type_id_runtime(const T & variable) noexcept;

   This is a factory method that is used to create instances of Derived classes. boost::typeindex::type_id_runtime(const T&) will call this method, if Derived has same type as boost::typeindex::type_index.

   Override: This function may be redefined and made public in Derived class.

   Parameters:

   `variable` | Variable which runtime type will be stored in type_index.

   Returns: | type_index with runtime type of variable.