jzon-rs 0.2.1

Zero-copy JSON serialization with compile-time generated typed parsers
Documentation 
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/// Accumulated statistics from a single `FromJson` parse run.
#[derive(Debug, Clone, Default)]
pub struct ScannerStats {
    /// String values returned as zero-copy `&'de str` borrows.
    pub zero_copy_borrows: u64,
    /// String values that required heap allocation (contained escape sequences).
    pub heap_allocations: u64,
    /// Total bytes consumed by the scanner.
    pub bytes_scanned: u64,
    /// Field-dispatch hint cache correct predictions.
    pub hint_hits: u64,
    /// Field-dispatch hint cache misses requiring full dispatch.
    pub hint_misses: u64,
}

impl ScannerStats {
    pub fn hint_hit_rate(&self) -> Option<f64> {
        let total = self.hint_hits + self.hint_misses;
        if total == 0 { None } else { Some(self.hint_hits as f64 / total as f64) }
    }

    pub fn zero_copy_rate(&self) -> Option<f64> {
        let total = self.zero_copy_borrows + self.heap_allocations;
        if total == 0 { None } else { Some(self.zero_copy_borrows as f64 / total as f64) }
    }
}