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This function is used for ANY=>!ANY conversions in the compatibility matrix to help differentiate between real NOOP (c_none) and pseudo conversions that are theorically supported at config parse time but can never occur at runtime,. That is, to explicit the fact that actual related runtime operations (e.g.: ANY->IPV4) are not NOOP since they might require some conversion to be performed depending on the input type. When checking the conf we don't know the effective out types so cast[pseudo type][pseudo type] is allowed in the compatibility matrix, but at runtime we only expect cast[real type][(real type || pseudo type)] because fetches and converters may not emit pseudo types, thus using c_none() everywhere was too ambiguous. The process will crash if c_pseudo() is invoked to help catch bugs: crashing here means that a pseudo type has been encountered on a converter's input at runtime (because it was emitted earlier in the chain), which is not supported and results from a broken sample fetch or converter implementation. (pseudo types may only be used as out_type in sample definitions for compatibility checks at parsing time)
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)