Explicit cast of a quantity type

Synopsis

Declared in <mp‐units/framework/quantity_cast.h>

template<
    QuantitySpec auto ToQS,
    typename FwdQ,
    Quantity Q = std::remove_cvref_t<FwdQ>>
requires (castable(Q::quantity_spec, ToQS)) && (MP_UNITS_WEAK_UNIT_OF(MP_UNITS_NONCONST_TYPE(Q::unit), ToQS))
[[nodiscard]]
constexpr
Quantity auto
quantity_cast(FwdQ&& q);

Description

This cast converts only a quantity type. It might be used to force some quantity type conversions that are not implicitly allowed but are allowed explicitly.

For example:

{.cpp}
 auto length = isq::length(42 * m);
 auto distance = quantity_cast<isq::distance>(length);
Note
 This cast does not affect the underlying value of a number stored in a quantity.

Template Parameters

Name

Description

ToQS

a quantity specification to use for a target quantity

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