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/// Asserts approximate equality within a given tolerance of two values with the
/// `ApproxEq` trait.
#[macro_export]
macro_rules! assert_approx_eq_eps(
    ($given: expr, $expected: expr, $eps: expr) => ({
        let eps = &($eps);
        let (given_val, expected_val) = (&($given), &($expected));
        if !ApproxEq::approx_eq_eps(given_val, expected_val, eps) {
            panic!("assertion failed: `left ≈ right` (left: `{:?}`, right: `{:?}`, tolerance: `{:?}`)",
                *given_val, *expected_val, *eps
            )
        }
    })
);

/// Asserts approximate equality within a given tolerance of two values with the
/// `ApproxEq` trait, with tolerance specified in ULPs.
#[macro_export]
macro_rules! assert_approx_eq_ulps(
    ($given: expr, $expected: expr, $ulps: expr) => ({
        let ulps = $ulps;
        let (given_val, expected_val) = (&($given), &($expected));
        if !ApproxEq::approx_eq_ulps(given_val, expected_val, ulps) {
            panic!("assertion failed: `left ≈ right` (left: `{:?}`, right: `{:?}`, tolerance: `{:?}`)",
                *given_val, *expected_val, ulps
            )
        }
    })
);

/// Asserts approximate equality of two values with the `ApproxEq` trait.
#[macro_export]
macro_rules! assert_approx_eq(
    ($given: expr, $expected: expr) => ({
        let (given_val, expected_val) = (&($given), &($expected));
        if !ApproxEq::approx_eq(given_val, expected_val) {
            panic!("assertion failed: `left ≈ right` (left: `{:?}`, right: `{:?}`, tolerance: `{:?}`)",
                *given_val, *expected_val,
                ApproxEq::approx_epsilon(Some(*given_val))
            )
        }
    })
);