User‐specializable variable template for runtime coordinate frame transformations.

Synopsis

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

template<
    /* implementation-defined */ auto From,
    /* implementation-defined */ auto To>
requires (From != To)
inline constexpr utility::unspecified_t frame_projection;

Description

Connects pairs of absolute point origin values with user‐supplied callables. Specialize per (From, To) pair with a callable invocable as: frame_projection<From, To>(quantity_point_at_From, extra_args...) ‐> quantity_point_at_To

Both directions must be explicitly specialized — the library never derives an inverse. The primary template defaults to utility::unspecified_t{} so that detail::HasFrameProjection can detect whether a specialization exists.

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