# cpp11 0.4.2
* Romain François is now the maintainer.
# cpp11 0.4.1
* Fix crash related to unwind protect optimization (#244)
# cpp11 0.4.0
## New Features
* New opt-in message formatting with the {fmt} C++ library for
`cpp11::messages()` `cpp11::stop()` and `cpp11::warning()`. Set the
`CPP11_USE_FMT` macro to use this feature in your
package. (@sbearrows, #169, #208)
* New `as_double()` and `as_integer()` methods to coerce integers to
doubles and doubles to integers to doubles (@sbearrows, #46)
* `cpp11::matrix` iterators can now be used either row-wise or
column-wise (the default) depending on the user's choice (@alyst,
#229)
## Improvements and fixes
* Read-only matrix accessors are now marked const (#234)
* `writable::r_vector` default constructors now return a 0 length
vector when converted to `SEXP` (#166)
* Read-only `r_vector` constructors now disallow implicit construction
with named arguments (#237)
* Read-only `r_vector.attr()` methods now return const objects, so it
is a compile time error to try to assign to them (#237)
* Fixed `+` and `+=` operators of `r_vector::[const_]iterator` to
conform the *iterators* concept: `+=` updates the iterator, and `+`
returns the updated copy, while keeping the original unchanged
(@alyst, #231)
* Remove undefined behavior when constructing global `cpp11::sexp`s (#224)
* Removed redundant `.Call calls` in cpp11.cpp file (@sbearrows, #170)
* Error messages now output original file name rather than the
temporary file name (@sbearrows, #194)
* `cpp_register()` now includes `attribute_visible` in the init
function, so packages compiled with `C_VISIBILITY` will find the
init function.
* Fixed bug when running `cpp_source()` on the same file more than
once (@sbearrows, #202)
* Allow cpp11 decorators of the form `cpp11::linking_to` (@sbearrows,
#193)
* Removed internal instances of `cpp11::stop()` and replaced with C++
exceptions (@sbearrows, #203)
* Names of named lists are now resized along with the list elements
(@sbearrows, #206)
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