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| title |
|---|
| function_traits |
{{< callout type="info">}}
Header: function_traits.h
Since: TBC
{{< /callout >}}
Allows the traits of functions to be determined.
template <typename TReturn, typename... TArgs>
struct function_traits<TReturn(*)(TArgs...)>
Member types
function_type
The signature of the function.
TReturn(TArgs...)
return_type
The return type.
TReturn
object_type
The object type, if a member function, otherwise void.
argument_types
An etl::type_list of the arguments.
etl::type_list<TArgs...>
Member constants
is_function
true if a free or static member function.
bool
is_member_function
true if a member function.
bool
is_const
true if a const member function.
bool
argument_count
The number of arguments.
size_t
Example
int free_int(int i, int j);
class Object
{
public:
int member_int(int i, int j);
int member_int_const(int i, int j) const;
static void member_static(int i, int j);
};
using traits1 = etl::function_traits<decltype(&free_int)>;
function_type int(int, int)
return_type int
object_type void
argument_types etl::type_list<int, int>
is_function true
is_member_function false
is_const false
argument_count 2
using traits2 = etl::function_traits<decltype(&Object::member_int)>;
function_type int(int, int)
return_type int
object_type Object
argument_types etl::type_list<int, int>
is_function false
is_member_function true
is_const false
argument_count 2
using traits3 = etl::function_traits<decltype(&Object::member_int_const)>;
function_type int(int, int) const
return_type int
object_type Object
argument_types etl::type_list<int, int>
is_function false
is_member_function true
is_const true
argument_count 2
using traits4 = etl::function_traits<decltype(&Object::member_static)>;
function_type void(int, int)
return_type void
object_type void
argument_types etl::type_list<int, int>
is_function true
is_member_function false
is_const false
argument_count 2