<mp-units/framework/quantity_spec.h>
template<
    /* implementation-defined */ auto QS,
    /* implementation-defined */ auto Eq,
    /* implementation-defined */ auto Args...>
requires (explicitly_convertible(Eq, QS))
struct quantity_spec<QS, Eq, Args...>
    : /* implementation-defined */
| Name | Description | 
|---|---|
| /* implementation-defined */ | 
| Name | 
|---|
| _base_type_ | 
| Name | 
|---|
| _equation_ | 
| _parent_ | 
| character | 
| dimension |