1 | #pragma once |
2 | |
3 | #include <type_traits> |
4 | #include <typeinfo> |
5 | #include <typeindex> |
6 | #include <string> |
7 | |
8 | #include <Common/Exception.h> |
9 | #include <common/demangle.h> |
10 | |
11 | |
12 | namespace DB |
13 | { |
14 | namespace ErrorCodes |
15 | { |
16 | extern const int BAD_CAST; |
17 | } |
18 | } |
19 | |
20 | |
21 | /** Perform static_cast in release build. |
22 | * Checks type by comparing typeid and throw an exception in debug build. |
23 | * The exact match of the type is checked. That is, cast to the ancestor will be unsuccessful. |
24 | */ |
25 | template <typename To, typename From> |
26 | To assert_cast(From && from) |
27 | { |
28 | #ifndef NDEBUG |
29 | try |
30 | { |
31 | if constexpr (std::is_pointer_v<To>) |
32 | { |
33 | if (typeid(*from) == typeid(std::remove_pointer_t<To>)) |
34 | return static_cast<To>(from); |
35 | } |
36 | else |
37 | { |
38 | if (typeid(from) == typeid(To)) |
39 | return static_cast<To>(from); |
40 | } |
41 | } |
42 | catch (const std::exception & e) |
43 | { |
44 | throw DB::Exception(e.what(), DB::ErrorCodes::BAD_CAST); |
45 | } |
46 | |
47 | throw DB::Exception("Bad cast from type " + demangle(typeid(from).name()) + " to " + demangle(typeid(To).name()), |
48 | DB::ErrorCodes::BAD_CAST); |
49 | #else |
50 | return static_cast<To>(from); |
51 | #endif |
52 | } |
53 | |