Trait spdlog::formatter::Pattern

source · 
pub trait Pattern: Send + Sync {
    fn format(
        &self,
        record: &Record<'_>,
        dest: &mut StringBuf,
        ctx: &mut PatternContext
    ) -> Result<()>;
}
Expand description

A pattern.

A pattern is like a formatter, except that multiple patterns can be combined in various ways to create a new pattern. The PatternFormatter struct provides a Formatter that formats log records according to a given pattern.

Built-in Patterns

spdlog provides a rich set of built-in patterns. See the pattern macro.

Custom Patterns

There are 2 approaches to create your own pattern:

  • Define a new type and implements this trait;
  • Use the pattern macro to create a pattern from a template string.

Required Methods

Format this pattern against the given log record and write the formatted message into the output buffer.

For implementors: the ctx parameter is reserved for future use. For now, please ignore it.

Implementations on Foreign Types

Implementors