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MakeMakefile#check_signedness
# File tmp/rubies/ruby-3.4.1/lib/mkmf.rb, line 1509
def check_signedness(type, headers = nil, opts = nil, &b)
typedef, member, prelude = typedef_expr(type, headers)
signed = nil
checking_for("signedness of #{type}", STRING_OR_FAILED_FORMAT) do
signed = try_signedness(typedef, member, [prelude], opts, &b) or next nil
$defs.push("-DSIGNEDNESS_OF_%s=%+d" % [type.tr_cpp, signed])
signed < 0 ? "signed" : "unsigned"
end
signed
end
Returns the signedness of the given type. You may optionally specify additional headers to search in for the type.
If the type is found and is a numeric type, a macro is passed as a preprocessor constant to the compiler using the type name, in uppercase, prepended with SIGNEDNESS_OF_, followed by the type name, followed by =X where “X” is positive integer if the type is unsigned and a negative integer if the type is signed.
For example, if size_t is defined as unsigned, then check_signedness('size_t') would return +1 and the SIGNEDNESS_OF_SIZE_T=+1 preprocessor macro would be passed to the compiler. The SIGNEDNESS_OF_INT=-1 macro would be set for check_signedness('int')