[SOLVED] C++ Enum storage size conversion prevention

C++ Enum storage size conversion prevention

Is is possible to prevent explicit enum storage size conversions? I tried overloading = but this does not seem to work on primitive types.

enum GlobalSettingTableType : std::uint16_t
{
   first = 0,
   second = 1,
   other = 1000 // out of range for uint8_t
};


GlobalSettingTableType test = GlobalSettingTableType::other;
std::uint16_t copyOK = test;
std::uint8_t copyfail = test; // Should not compile

Solution

Depending on compiler you are using you can tweak warnings to file an error if there is mismatch between emum and target integer type.

MSVC simple /W4 covers this scenario - it enables C4244.
clang requires adding -Wconversion (standard set -Wall -Wextra -pedantic is not enogh)
gcc has some flags (for example -Wenum-int-mismatch), but they are working only for C and Objective-C only (I do not know why). I've failed to find alternative gcc flag which would work for C++.

Here is godbolt demo

In case you are writing a new code, using braces as coding convention is a good solution for all compilers - as Pepijn Kramer proposed in comment.
Tweaking warnings should be good for already existing code.