std::meta::constant_of

constexpr std::meta::info constant_of( std::meta::info r );

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

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

See also