std::meta::display_string_of, std::meta::u8display_string_of
Defined in header <meta> | ||
|---|---|---|
consteval std::string_view display_string_of( std::meta::info r ); | (1) | (since C++26) |
consteval std::u8string_view u8display_string_of( std::meta::info r ); | (2) | (since C++26) |
Returns an implementation-defined string. Implementations are encouraged to produce text that is helpful in identifying what r represents.
Parameters
| r | - | a reflection value |
Return value
An implementation-defined string. Where possible, the string should be suitable for identifying the represented construct.
Notes
The result V is null-terminated: V.data()[V.size()] is guaranteed to be '\0'. Each element in V is a potentially non-unique object with static storage duration that is usable in constant expressions; a pointer to such an element is not suitable for use as a template argument for a non-type template parameter of pointer type.
Example
#include <iostream>
#include <meta>
#include <vector>
struct S { int m; };
enum class E { e };
void foo() noexcept;
int main()
{
constexpr static auto names =
{
std::define_static_string(display_string_of(^^S)),
std::define_static_string(display_string_of(^^S::m)),
std::define_static_string(display_string_of(^^E)),
std::define_static_string(display_string_of(^^E::e)),
std::define_static_string(display_string_of(^^foo)),
std::define_static_string(display_string_of(^^std)),
std::define_static_string(display_string_of(^^std::vector<int>))
};
for (const auto& name : names)
std::cout << name << '\n';
}
Possible output:
S S::m E E::e void foo() std std::vector<int>
See also
|
(C++26)(C++26) | if the reflected entity has an identifier, obtains its name (function) |
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