Specialization for a measured constant declaring its relative standard uncertainty
Declared in <mp-units/framework/unit_definitions.h>
template<
symbol_text Symbol,
Unit auto U,
typename M,
relative_standard_uncertainty<M> RSU>
requires (!Symbol.empty()) && detail::magnitude_is_positive<M{}>
struct named_constant<Symbol, U, RSU>
: ::_base_type_The same as the above but additionally stores the relative standard uncertainty of a constant that is measured rather than exact by definition. The value transcribes the entry published in the source metrology table (e.g., CODATA).
| Name | Description |
|---|---|
::_base_type_ |
| Name |
|---|
_base_type_ |
| Name | Description |
|---|---|
_relative_standard_uncertainty_ | |
_symbol_ | Unique constant identifier |
| Name | Description |
|---|---|
| Symbol | a short text representation of the constant |
| Unit | a unit that we use to define a constant |
| RSU | the relative standard uncertainty of the measured value |