Explicit cast of a quantity type
<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);
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);
This cast does not affect the underlying value of a number stored in a quantity.
| Name | Description |
|---|---|
| ToQS | a quantity specification to use for a target quantity |