Enum ProjVgridshiftArithmetic 

pub enum ProjVgridshiftArithmetic {
    SeparateMultiplyAdd,
    FusedMultiplyAdd,
}

Floating-point evaluation recipe for PROJ vertical-grid interpolation.

PROJ 9.3.0 expresses its final three accumulation steps as ordinary C++ multiply/add statements and does not set a contraction policy. Consequently, conforming builds can differ by one ULP depending on compiler, target, and build flags. Selecting the recipe explicitly makes the requested behavior reproducible instead of guessing from the Rust compilation target.

Variants

SeparateMultiplyAdd

Round the multiplication and addition separately.

This matches PROJ builds where floating-point contraction is disabled, including the reviewed default x86-64 Clang build of PROJ 9.3.0.

FusedMultiplyAdd

Evaluate each accumulation as a fused multiply-add with one rounding.

This matches PROJ builds where the compiler contracts the statements, including the AArch64 PROJ 9.3.0 build used for the dense fixture.

Trait Implementations

impl Clone for ProjVgridshiftArithmetic

fn clone(&self) -> ProjVgridshiftArithmetic

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ProjVgridshiftArithmetic

impl Debug for ProjVgridshiftArithmetic

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ProjVgridshiftArithmetic

impl PartialEq for ProjVgridshiftArithmetic

fn eq(&self, other: &ProjVgridshiftArithmetic) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ProjVgridshiftArithmetic