Defines the concepts used to constrain unit, conversion-factor, and arithmetic template parameters.

Concepts
concept	units::ArithmeticType
	Concept for types which represent arithmetic types.
concept	units::NonArithmeticType
	Concept for types which represent non-arithmetic types.
concept	units::RatioType
	Concept for types which represent std::ratios.
concept	units::ConversionFactorType
	Concept for types which represent conversion factors.
concept	units::NumericalScaleType
	Concept for types which represent numerical scales.
concept	units::UnitType
	Concept for types which represent units.
concept	units::DimensionedUnitType
	Concept for types which represent units with a dimension (i.e.
concept	units::DimensionlessUnitType
	Concept for types which represent units without a dimension (dimensionless).
concept	units::same_dimension
	Concept for types which represent units of the same dimensionality.
concept	units::Dimensionless
	Concept satisfied by any unit whose SI dimension is dimensionless; being dimension-keyed it.
concept	units::AbsoluteType
	Concept satisfied by any absolute<U> point wrapper.
concept	units::DeltaType
	Concept satisfied by any delta<U> amount wrapper.
concept	units::KindType
	Concept satisfied by any string-tagged kind<Tag, U>.

Defines the concepts used to constrain unit, conversion-factor, and arithmetic template parameters.

Concepts