std::meta::reflect_constant
Defined in header <meta> | ||
|---|---|---|
template< class T > consteval std::meta::info reflect_constant( T expr ); | (since C++26) |
Returns a reflection that represents either the value of expr (if T is a ScalarType) or the template parameter object with value expr (if T is a class type).
Formally, let:
-
Vbe: - if
Tis a class type, then an object that is template-argument-equivalent to the value ofexpr; - otherwise, the value of
expr; -
TClsbe the invented templatetemplate<T P> struct TCls;
This function returns std::meta::template_arguments_of(^^TCls<V>)[0].
The program is ill-formed if std::is_copy_constructible_v<T> is false, if T is not a cv-unqualified structural type, or if T is a reference type.
Parameters
| expr | - | a value of a structural type |
Return value
A reflection as described above.
Exceptions
Throws std::meta::exception if TCls<V> is invalid.
Example
See also
|
(C++26) | promotes a compile-time string to static storage, returning a reflection representing the static string (function template) |
|
(C++26) | promotes compile-time array into static storage, returning a reflection representing the static array (function template) |
|
(C++26) | returns a reflection representing an object, suitable for use as a constant template argument (function template) |
|
(C++26) | returns a reflection representing a function, suitable for use as a constant template argument (function template) |
|
(C++26) | substitutes reflected arguments in the reflected template (function template) |
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