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math.fractions: document the remaining functions in math.fractions

pull/7144/head
Delyan Angelov 2020-12-05 12:23:18 +02:00
parent f7861774cf
commit 7d9d42b2e2
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1 changed files with 3 additions and 0 deletions
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vlib/math/fractions/fraction.v
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@ -216,6 +216,7 @@ fn abs(num i64) i64 {
} }
} }
// cmp_i64s compares the two arguments, returns 0 when equal, 1 when the first is bigger, -1 otherwise
fn cmp_i64s(a i64, b i64) int { fn cmp_i64s(a i64, b i64) int {
if a == b { if a == b {
return 0 return 0
@ -226,6 +227,7 @@ fn cmp_i64s(a i64, b i64) int {
} }
} }
// cmp_f64s compares the two arguments, returns 0 when equal, 1 when the first is bigger, -1 otherwise
fn cmp_f64s(a f64, b f64) int { fn cmp_f64s(a f64, b f64) int {
// V uses epsilon comparison internally // V uses epsilon comparison internally
if a == b { if a == b {
@ -243,6 +245,7 @@ fn safe_to_multiply(a i64, b i64) bool {
return (bits.len_64(u64(abs(a))) + bits.len_64(u64(abs(b)))) < 64 return (bits.len_64(u64(abs(a))) + bits.len_64(u64(abs(b)))) < 64
} }
// cmp compares the two arguments, returns 0 when equal, 1 when the first is bigger, -1 otherwise
fn cmp(f1 Fraction, f2 Fraction) int { fn cmp(f1 Fraction, f2 Fraction) int {
if safe_to_multiply(f1.n, f2.d) && safe_to_multiply(f2.n, f1.d) { if safe_to_multiply(f1.n, f2.d) && safe_to_multiply(f2.n, f1.d) {
return cmp_i64s(f1.n * f2.d, f2.n * f1.d) return cmp_i64s(f1.n * f2.d, f2.n * f1.d)