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This PR refactors how we collect statistics.
It splits the current statistic values into the values and a proxy object. The actual values now live inside the registry (making the ownership model way easier) while the proxy object are handed to whoever wants to collect a new statistic.
It also extends the C++ API to obtain and inspect the statistics.
To change the ownership, this PR needs to touch every single statistic in the whole codebase and change how it is registered.
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The build system (cmake) will automatically generate an export header
cvc4_export.h, which makes sure that the correct export features are
defined depending on the compiler and target platform. The macro CVC4_EXPORT
replaces CVC4_PUBLIC and its usage is reduced by 2/3.
Co-authored-by: Gereon Kremer <nafur42@gmail.com>
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This PR does a first round of refactoring on the statistics, in particular the Stat class and derived classes.
It significantly shrinks the class hierarchy, modernizes some code (e.g. use std::chrono instead of clock_gettime), removes unused features (e.g. nesting of statistics) and does some general cleanup and consolidation.
Subsequent PRs are planned to change the ownership model (right now every module owns the Stat object) which makes the whole register / unregister mechanism obsolete.
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