method

have_struct_member

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 (0)
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#have_struct_member

have_struct_member(type, member, headers = nil, &b) public

Returns whether or not the struct of type type contains member. If it does not, or the struct type can’t be found, then false is returned. You may optionally specify additional headers in which to look for the struct (in addition to the common header files).

If found, a macro is passed as a preprocessor constant to the compiler using the type name and the member name, in uppercase, prepended with ‘HAVE_’.

For example, if have_struct_member(‘struct foo’, ‘bar’) returned true, then the HAVE_STRUCT_FOO_BAR preprocessor macro would be passed to the compiler.

HAVE_ST_BAR is also defined for backward compatibility.

Show source

# File lib/mkmf.rb, line 1000
def have_struct_member(type, member, headers = nil, &b)
  checking_for checking_message("#{type}.#{member}", headers) do
    if try_compile(#{cpp_include(headers)}/*top*/#{MAIN_DOES_NOTHING}int s = (char *)&((#{type}*)0)->#{member} - (char *)0;, &b)
      $defs.push(format("-DHAVE_%s_%s", type.tr_cpp, member.tr_cpp))
      $defs.push(format("-DHAVE_ST_%s", member.tr_cpp)) # backward compatibility
      true
    else
      false
    end
  end
end

have_struct_member

Related methods

Method deprecated or moved

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