jetlog

Fast, lock-less and type-safe logging for small embedded systems.

Features

• Thread-safe: Usable from multiple threads and interrupts.
• Minimal dependencies: Relies only on atomic operations and ETL, avoiding platform-specific features.
• High performance: Fast writer; formatting is deferred to the reader.
• Circular buffer: Fixed memory usage.
• Type-safe: Ensures correctness at compile time.
• Modern formatting: Supports a subset of std::format-style syntax.
• Configurable types support: You can select only required types to minimize overhead.

Requires: C++17

Usage

See the examples folder.

This package depends on ETL but does not pin a version, to avoid conflicts with your application. Pin it in your application instead.

Supported Formats

// Simple placeholder without format
{}

// Hexadecimal (lowercase/uppercase)
{:x}  // ff
{:X}  // FF

// Hexadecimal with base prefix
{:#x} // 0xff
{:#X} // 0XFF

// Zero-padded hexadecimal
{:04x} // 00ff

// Binary format
{:b}   // 101010
{:#b}  // 0b101010

// Decimal (default for integral types)
{:d}   // 42

Supported Types

By default: integers up to 32 bits, bool and string-like parameters. To add 64-bit integers or floating point, list them in the Codecs<> option of your config, see codecs for what is available.

Tag and format are stored by pointer and must outlive their records. String arguments are copied unless wrapped in jetlog::static_str.