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Make overload_cast_impl available in C++11 mode. (#1581)

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* Make `overload_cast_impl` available in C++11 mode.

Narrow the scope of the `#if defined(PYBIND11_CPP14)` block around overload_cast to only
cover the parts where C++14 is stricly required. Thus, the implementation in
`pybind11::details::overload_cast_impl` is still available in C++11 mode.

* PR #1581: Modify test to use overload_cast_impl, update docs and change log
This commit is contained in:
Andre Schmeißer
2019-08-19 12:54:33 +02:00
committed by Wenzel Jakob
parent 04c8f4b56e
commit 19189b4c2c
4 changed files with 31 additions and 13 deletions
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docs/classes.rst
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@@ -422,6 +422,17 @@ on constness, the ``py::const_`` tag should be used:
.def("foo_mutable", py::overload_cast<int, float>(&Widget::foo))
.def("foo_const", py::overload_cast<int, float>(&Widget::foo, py::const_));
If you prefer the ``py::overload_cast`` syntax but have a C++11 compatible compiler only,
you can use ``py::detail::overload_cast_impl`` with an additional set of parentheses:
.. code-block:: cpp
template <typename... Args>
using overload_cast_ = pybind11::detail::overload_cast_impl<Args...>;
py::class_<Pet>(m, "Pet")
.def("set", overload_cast_<int>()(&Pet::set), "Set the pet's age")
.def("set", overload_cast_<const std::string &>()(&Pet::set), "Set the pet's name");
.. [#cpp14] A compiler which supports the ``-std=c++14`` flag
or Visual Studio 2015 Update 2 and newer.