method

check_signedness

Ruby latest stable (v2_5_5) - 0 notes - Class: Object

1_8_6_287
1_8_7_72
1_8_7_330
1_9_1_378
1_9_2_180 (0)
1_9_3_125 (0)
1_9_3_392 (0)
2_1_10
2_2_9
2_4_6
2_5_5
2_6_3
What's this?

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v1_9_3_392) is shown here.

These similar methods exist in v2_5_5:

MakeMakefile#check_signedness

check_signedness(type, headers = nil, opts = nil, &b) public

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, or negative integer if the type is signed.

For example, if size_t is defined as unsigned, then check_signedness(‘size_t’) would returned +1 and the SIGNEDNESS_OF_SIZE_T=+1 preprocessor macro would be passed to the compiler, and SIGNEDNESS_OF_INT=-1 if check_signedness(‘int’) is done.

Show source

# File lib/mkmf.rb, line 1178
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

check_signedness

Related methods

Method deprecated or moved