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The "%lu" format expects an argument of type "long unsigned int", but "int64_t" is an alias for "long long int" on ARM32 platforms.

The common case of TypeTraits::from_string should use the target type's constructor, this removes the need to specialize it for those that support String-type constructors, ex: Path.

Add basic benchmarking mechanism, with an emphasis on microbenchmarks.

Prefer C++20 bit header to endianess macros
Use std::countl_zero instead of __builtin_clzll.

Add TypeTraits specialisation for filesystem paths, so that paths can be specified as arguments to command-line options.

@rfernandes reported an issue with the std/variant header in GCC 9.1.0 that breaks the build.

With C++17 the tuple iteration functions can be replaced with std::apply and fold expression, therefore there is no need for custom code.

Update usage of cppcheck. Switch to C++20 and remove fixed suppressions.

The ThreadConfig structure should be extended to include an isolcpus-style affinity mask, along with helper functions for parsing and setting thread affinity.

Implement support for dns request / response with the goal of allowing a asyncronous host -> ip resolution mechanism.

Add the following convenience headers:

• toolbox/util.hpp
• toolbox/sys.hpp
• toolbox/io.hpp
• toolbox/ipc.hpp
• toolbox/net.hpp

These headers will simplify small examples, utilities and help new users unfamiliar with the code to get started.

The Config reader currently supports numeric enum values only.
Add support for parsing symbolic enum values.

GCC 9.1 exposed a dormant bug in the DNS resolver that causes the run loop to crash when clearing tasks from the queue. The crash was caused by accessing uninitialised elements of a local array.

Implement "spaceship operator" where comparison operators were used
Refactor Compare functionality into new comparison operators.

Improve benchmark framework as follows:

• add support for benchmarks that depend on non-trivial initialisation.
• refactor and cleanup hdr files, so that they are more aligned with style guide.
• move benchmark components to separate library.
• move benchmark tests to separate directory.

To avoid external dependencies, implement a pure C++ version of HdrHistogram.

The current goal includes only a subset of the features supported in the original version.

In the initial epoll_create() implementation, the size argument informed the kernel of the number of file descriptors that the caller expected to add to the epoll instance. Modern kernels no longer require this hint.

Enable coverage builds and report generation.

Add clang-format check to the circleci steps

Both gcc and clang support Address and Thread sanitization builds.
Add those as cmake build types.

Build Deb package using CPack and integrate with CircleCI, so that the package is deployed as a GitHub release artefact.

Our custom toolchain image uses:

• Boost 1.67.0
• Clang 7.0.1
• GCC 8.3

We might be able to lower the requirements to 1.63.0, but I have not tried.

I don't reason any reason not to keep the RPM and, although we don't use it, it may have wider appeal.

Regarding CircleCI, I double-checked the YML file and it will upload all artefacts in build/dist, so it should work without change.

Add new on_sock_init lifecycle callback, so that applications are given an opportunity to set socket options such as SO_RCVBUF and SO_SNDBUF.

Add HTTP client and server components along with related examples.

Although the Exception class is designed to represent different kinds of exception, the current JSON format is quite specific to HTTP. The format should be generalised and brought more in line with the emerging OpenAPI standard.

Rename Interruptible interface to Notifiable for greater consistency with IPC Channels in Matchbox.