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Description

The Char_t typedef here:

is incorrect--a bare char is not guaranteed to be signed or unsigned.

char — type for character representation which can be most efficiently processed on the target system (has the same representation and alignment as either signed char or unsigned char, but is always a distinct type). Multibyte characters strings use this type to represent code units. For every value of type unsigned char in range [​0​, 255], converting the value to char and then back to unsigned char produces the original value.(since C++11) The signedness of char depends on the compiler and the target platform: the defaults for ARM and PowerPC are typically unsigned, the defaults for x86 and x64 are typically signed.

To actually guarantee to be a signed type, Char_t would have to be declared as signed char.

From another issue, it appears ROOT is moving away from Rtypes.h since the C++ standard has a evolved a more complete type system, so this may be a "who cares" issue...

Reproducer

n/a

ROOT version

latest

Installation method

n/a

Operating system

n/a

Additional context

No response