v2.0.0

• flow.log: Significantly improve performance of Logger::should_log(), invoked at ~every log call site. To enable, requires small code change when invoking flow::log::Config::init_component_to_union_idx_mapping(). #94
• C++20 mode build and GitHub-CI-pipeline support. C++17 remains the main/minimal mode, but we now ensure user can build/use in C++20 mode also. #95
• flow.perf: Minor perf improvements.
• Dependency bump: Boost v1.84 to 1.87. Results in slight breaking API changes in flow::error. #99
• Add a unit-test suite to Flow. (Flow now gains GTest dependency if built with test-suite enabled.)
• GitHub CI pipeline: Tweak to get gcc-13 builds to work again (GitHub changed preinstalled packages).
• Comment and/or doc changes.

Full Changelog: v1.0.2...v2.0.0

API notes

• New APIs:
  • flow::log::Config::init_component_to_union_idx_mapping() new optional arg component_payload_type_info_ptr_is_uniq = false; set to true for potentially significant performance gains within Flow and flow.log log call sites in your application.
    • Two optional preprocessor defines to further tweak perf-related internal behavior: FLOW_LOG_CONFIG_COMPONENT_PAYLOAD_TYPE_DICT_BY_PTR, FLOW_LOG_CONFIG_COMPONENT_PAYLOAD_TYPE_DICT_BY_VAL.
• Breaking changes:
  • A mostly, but not fully, backward-compatible improvement in the API for macro FLOW_ERROR_EXEC_AND_THROW_ON_ERROR():
    • Remove any cref() wrappers for args 3+ to this macro; this is no longer necessary and will likely not compile.
    • Ideally remove now-unnecessary method Qualifiers:: in arg 2 (function name).
  • Removal of macro FLOW_ERROR_EXEC_FUNC_AND_THROW_ON_ERROR().
    • If you were using this, simply change it to FLOW_ERROR_EXEC_AND_THROW_ON_ERROR which now supports free functions.