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Add static_assert to holder casters

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The holder casters assume but don't check that a `holder<type>`'s `type`
is really a `type_caster_base<type>`; this adds a static_assert to make
sure this is really the case, to turn things like
`std::shared_ptr<array>` into a compilation failure.

Fixes #785
This commit is contained in:
Jason Rhinelander 2017-04-07 11:11:14 -04:00
parent d994db2da0
commit 501135fa76
1 changed files with 5 additions and 0 deletions
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5
include/pybind11/cast.h
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@ -902,6 +902,8 @@ template <typename type, typename holder_type>
struct copyable_holder_caster : public type_caster_base<type> {
public:
using base = type_caster_base<type>;
static_assert(std::is_base_of<base, type_caster<type>>::value,
"Holder classes are only supported for custom types");
using base::base;
using base::cast;
using base::typeinfo;
@ -1018,6 +1020,9 @@ class type_caster<std::shared_ptr<T>> : public copyable_holder_caster<T, std::sh
template <typename type, typename holder_type>
struct move_only_holder_caster {
static_assert(std::is_base_of<type_caster_base<type>, type_caster<type>>::value,
"Holder classes are only supported for custom types");
static handle cast(holder_type &&src, return_value_policy, handle) {
auto *ptr = holder_helper<holder_type>::get(src);
return type_caster_base<type>::cast_holder(ptr, &src);