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    std::meta::constant_of

    From cppreference.com
    < cpp | meta
     
    C++
     
    Metaprogramming library
     
    Reflection library
     
    Defined in header <meta> 
    constexpr std::meta::info constant_of( std::meta::info r );
    		(since C++26)
    See More

    Returns a reflection of the (constant) value of what r represents.

    Formally:

    • If r represents an annotation, returns its underlying constant (std::meta::reflect_constant(expr) where expr is the annotation's constant expression).
    • Otherwise, let R be a constant expression equal to r:
    • If r represents a variable or object of array type, returns std::meta::reflect_constant_array([:R:]).
    • Otherwise, if r represents a function, returns std::meta::reflect_function([:R:]).
    • Otherwise, returns std::meta::reflect_constant([:R:]).

    Parameters

    r - a reflection value

    Return value

    A reflection of the value of what r represents.

    Exceptions

    Throws std::meta::exception unless either r represents an annotation or [:R:] is a valid splice expression.

    Notes

    The result represents a function if r represents a function, a template parameter object if r represents a variable or object of array or class type, or a (scalar) value if r represents a variable or object of scalar type.

    Example

    This section is incomplete
    Reason: no example

    See also

    (C++26)
    		 returns a reflection representing a value or template parameter object, suitable for use as a constant template argument
    (function template) [edit]
    (C++26)
    		 promotes compile-time array into static storage, returning a reflection representing the static array
    (function template) [edit]
    (C++26)
    		 returns a reflection representing a function, suitable for use as a constant template argument
    (function template) [edit]