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+# Changelog
+
+This is the changelog for `cxxopts`, a C++11 library for parsing command line
+options. The project adheres to semantic versioning.
+
+## Next version
+
+### Changed
+
+* Only search for a C++ compiler in CMakeLists.txt.
+* Allow for exceptions to be disabled.
+* Fix duplicate default options when there is a short and long option.
+* Add `CXXOPTS_NO_EXCEPTIONS` to disable exceptions.
+* Fix char parsing for space and check for length.
+
+## 2.2
+
+### Changed
+
+* Allow integers to have leading zeroes.
+* Build the tests by default.
+* Don't check for container when showing positional help.
+
+### Added
+
+* Iterator inputs to `parse_positional`.
+* Throw an exception if the option in `parse_positional` doesn't exist.
+* Parse a delimited list in a single argument for vector options.
+* Add an option to disable implicit value on booleans.
+
+### Bug Fixes
+
+* Fix a warning about possible loss of data.
+* Fix version numbering in CMakeLists.txt
+* Remove unused declaration of the undefined `ParseResult::get_option`.
+* Throw on invalid option syntax when beginning with a `-`.
+* Throw in `as` when option wasn't present.
+* Fix catching exceptions by reference.
+* Fix out of bounds errors parsing integers.
+
+## 2.1.1
+
+### Bug Fixes
+
+* Revert the change adding `const` type for `argv`, because most users expect
+  to pass a non-const `argv` from `main`.
+
+## 2.1
+
+### Changed
+
+* Options with implicit arguments now require the `--option=value` form if
+  they are to be specified with an option. This is to remove the ambiguity
+  when a positional argument could follow an option with an implicit value.
+  For example, `--foo value`, where `foo` has an implicit value, will be
+  parsed as `--foo=implicit` and a positional argument `value`.
+* Boolean values are no longer special, but are just an option with a default
+  and implicit value.
+
+### Added
+
+* Added support for `std::optional` as a storage type.
+* Allow the help string to be customised.
+* Use `const` for the type in the `argv` parameter, since the contents of the
+  arguments is never modified.
+
+### Bug Fixes
+
+* Building against GCC 4.9 was broken due to overly strict shadow warnings.
+* Fixed an ambiguous overload in the `parse_positional` function when an
+  `initializer_list` was directly passed.
+* Fixed precedence in the Boolean value regex.
+
+## 2.0
+
+### Changed
+
+* `Options::parse` returns a ParseResult rather than storing the parse
+  result internally.
+* Options with default values now get counted as appearing once if they
+  were not specified by the user.
+
+### Added
+
+* A new `ParseResult` object that is the immutable result of parsing. It
+  responds to the same `count` and `operator[]` as `Options` of 1.x did.
+* The function `ParseResult::arguments` returns a vector of the parsed
+  arguments to iterate through in the order they were provided.
+* The symbol `cxxopts::version` for the version of the library.
+* Booleans can be specified with various strings and explicitly set false.
+
+## 1.x
+
+The 1.x series was the first major version of the library, with release numbers
+starting to follow semantic versioning, after 0.x being unstable.  It never had
+a changelog maintained for it. Releases mostly contained bug fixes, with the
+occasional feature added.