Make it possible to generate constexpr signatures in C++11 mode
The current C++14 constexpr signatures don't require relaxed constexpr,
but only `auto` return type deduction. To get around this in C++11,
the type caster's `name()` static member functions are turned into
`static constexpr auto` variables.
diff --git a/tests/test_copy_move.cpp b/tests/test_copy_move.cpp
index 94113e3..98d5e0a 100644
--- a/tests/test_copy_move.cpp
+++ b/tests/test_copy_move.cpp
@@ -86,7 +86,7 @@
protected:
CopyOnlyInt value;
public:
- static PYBIND11_DESCR name() { return _("CopyOnlyInt"); }
+ static constexpr auto name = _("CopyOnlyInt");
bool load(handle src, bool) { value = CopyOnlyInt(src.cast<int>()); return true; }
static handle cast(const CopyOnlyInt &m, return_value_policy r, handle p) { return pybind11::cast(m.value, r, p); }
static handle cast(const CopyOnlyInt *src, return_value_policy policy, handle parent) {