25 lines
977 B
Rust
25 lines
977 B
Rust
use super::comparison::Offset;
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pub fn approx_equal(a: f64, b: f64, dp: u8) -> bool {
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let p = 10f64.powi(-(dp as i32));
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(a - b).abs() < p
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}
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fn aprox_equal_within_percentage_range(actual: f64, expectation: f64, percentage: f64) -> bool {
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assert!(percentage.is_sign_positive() && percentage <= 100.);
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let factor = 0.01 * percentage as f64;
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actual >= expectation - (factor * expectation) && actual <= expectation + (factor * expectation)
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}
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fn approx_equal_within_offset_range(actual: f64, expectation: f64, offset: f64) -> bool {
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assert!(offset >= 0., "offset must be positive");
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actual >= expectation - offset && actual <= expectation + offset
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}
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pub fn approximate_within_range(actual: f64, expectation: f64, offset: &Offset) -> bool {
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match offset {
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Offset::Absolute(a) => approx_equal_within_offset_range(actual, expectation, *a),
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Offset::Percentage(p) => aprox_equal_within_percentage_range(actual, expectation, *p),
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}
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}
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