Commits on Mar 24, 2018

1. Add support for C++ boost::regex to benchmarks …

   This is very similar to the `std::regex` benchmark implementation since Boost.Regex and `std::regex` have very similar APIs and regex grammar support. As such, it uses the `stdcpp` Rust and C FFIs to reduce code duplication.
   
    * bench/Cargo.toml: add `re-boost` feature
    * bench/build.rs: add `cboost` library to bench build. This uses a compiler preprocessor definition to indicate whether or not to use Boost when compiling the `stdcpp` FFI.
    * bench/compile: add `re-boost` feature to bench compile script
    * bench/run: add `re-boost` feature to bench run script
    * bench/src/bench.rs: use `ffi::stdcpp::Regex`, define its `text!` macro, and `Text` type for feature `re-boost`
    * bench/src/ffi/mod.rs: declare `stdcpp` module for `re-boost` feature
    * bench/src/ffi/stdcpp.cpp: implement C API using C++ `boost::regex`. The Boost.Regex API is very similar to the `std::regex` API and therefore only uses a different namespace.
    * bench/src/main.rs: add boost to bench main
    * bench/src/misc.rs:
       - do not run `match_class_unicode` benchmark for `re-boost` feature because `boost::regex` ECMAScript grammar does not support unicode character classes
    * bench/src/sherlock.rs:
       - do not run `letters`, `letters_upper`, and `letters_lower` benchmarks for `re-boost` feature because `boost::regex` ECMAScript grammar does not support unicode character classes
       - use a different regex for `everything_greedy` benchmark because `boost::regex` '.' does not match '\r'
       - `words` benchmark for `boost::regex` matches RE2 test result, so use that test for `re-boost` feature as well. Also fixes conditional compilation issue for `re-stdcpp`.
       - do not run `holmes_coword_watson` benchmark for `re-boost` feature because Boost.Regex implementation currently seems to have exponential behavior here

   

   mkrupcale committed Mar 24, 2018
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