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more informative error message when py::cast fails

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This commit is contained in:
Wenzel Jakob 2016-07-01 16:07:24 +02:00
parent fb0e2e5dac
commit 472ffbba96
1 changed files with 8 additions and 2 deletions
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10
include/pybind11/cast.h
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@ -807,8 +807,14 @@ NAMESPACE_END(detail)
template <typename T> T cast(handle handle) {
typedef detail::type_caster<typename detail::intrinsic_type<T>::type> type_caster;
type_caster conv;
if (!conv.load(handle, true))
throw cast_error("Unable to cast Python object to C++ type");
if (!conv.load(handle, true)) {
#if defined(NDEBUG)
throw cast_error("Unable to cast Python instance to C++ type (compile in debug mode for details)");
#else
throw cast_error("Unable to cast Python instance of type " +
(std::string) handle.get_type().str() + " to C++ type '" + type_id<T>() + "''");
#endif
}
return conv.operator typename type_caster::template cast_op_type<T>();
}