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| title |
|---|
| type-lookup |
{{< callout type="info">}}
Header: type_lookup.h
{{< /callout >}}
Compile time mapping of id to type, type to id and type to type.
This file is generated from type_lookup_generator.h and can be created by running generate_type_lookup.bat.
For a less complex solution for simple id to type lookup, see etl::type_select.
type_id_pair
Support structure for type_id_lookup.
etl::type_id_pair<typename T, size_t ID>
Defines
type The type.
ID The id associated with the type.
type_type_pair
Support structure for type_type_lookup.
etl::type_type_pair<typename T1, typename T2>
Defines
type1 The indexing type.
type2 The associated type.
type_id_lookup
Creates a class for compile time id to type and type to id mappings.
etl::type_id_lookup<typename T1, ...>
The number of types that can be handled is determined by the generator.
Each template parameter is a type_id_pair.
The class contains two nested templates.
type_from_id
Gets the type from the id.
type_from_id<size_t ID>
Defines
type The associated type.
C++14 and above
template <int ID>
using type_from_id_t = typename type_from_id<ID>::type;
id_from_type
id_from_type<typename T>
Gets the id from the type.
Defines
ID The associated id.
C++ 17 and above
template <typename T>
constexpr size_t id_from_type_v = id_from_type<T>::value;
Static functions
template <typename T>
static unsigned int get_id_from_type(const T&)
Gets the id from the type.
template <typename T>
static unsigned int get_id_from_type()
Gets the id from the type.
type_type_lookup
Creates a class for compile time type to type mapping.
etl::type_id_lookup<typename T1, ...>
The number of types that can be handled is determined by the generator.
Each template parameter is a type_id_pair.
The class contains one nested template.
type_from_type
type_from_type<typename T>
Defines
type The associated type.
C++14 and above
template <typename T>
using type_from_type_t = typename type_from_type<T>::type;
nth_type
Gets the nth type in a variadic type list.
template <size_t N, typename... TTypes>
struct nth_type
Defines member type as the nth type in the variadic type list.
template <size_t N, typename... TTypes>
using nth_type_t = typename nth_type<N, TTypes...>::type;
Type alias defined as the nth type in the variadic type list.
Examples
enum
{
INT32 = 32,
STRING = 1,
UINT8 = 8,
OTHER = 0
};
typedef etl::type_id_pair<int32_t, INT32> TypeIdInt32;
typedef etl::type_id_pair<uint8_t, UINT8> TypeIdUint8;
typedef etl::type_id_pair<std::string, STRING> TypeIdString;
// Type from Id / Id from Type.
typedef etl::type_id_lookup<TypeIdInt32, TypeIdString, TypeIdUint8> TypeIdLookup;
// int32_t
typename TypeIdLookup::type_from_id_t<INT32>
// uint8_t
typename TypeIdLookup::type_from_id_t<UINT8>
// std::string
typename TypeIdLookup::type_from_id_t<STRING>
// Compile error
typename TypeIdLookup::type_from_id_t<OTHER>
// INT32
TypeIdLookup::id_from_type_v<int32_t>
// UINT8
TypeIdLookup::id_from_type_v<uint8_t>
// STRING
TypeIdLookup::id_from_type_v<std::string>
// Compile error
TypeIdLookup::id_from_type_v<double>
---
type_type_lookup
// Get the next larger type.
typedef etl::type_type_pair<int16_t, int32_t> TypeInt16;
typedef etl::type_type_pair<uint8_t, uint16_t> TypeUint8;
typedef etl::type_type_pair<float, double> TypeFloat;
// Type from Type.
etl::type_type_lookup<TypeInt16, TypeUint8, TypeFloat> TypeTypeLookup;
// int32_t
typename TypeTypeLookup::type_from_type_t<int16_t>
// uint16_t
typename TypeTypeLookup::type_from_type_t<uint8_t>
// double
typename TypeTypeLookup::type_from_type_t<float>
// Compile error
typename TypeTypeLookup::type_from_type_t<int32_t>