method
try_const
ruby latest stable - Class:
Object
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.
try_const(const, headers = nil, opt = "", &b)public
Returns whether or not the Constant const is defined.
See also have_const
# File lib/mkmf.rb, line 1078
def try_const(const, headers = nil, opt = "", &b)
const, type = *const
if try_compile(#{cpp_include(headers)}/*top*/typedef #{type || 'int'} conftest_type;conftest_type conftestval = #{type ? '' : '(int)'}#{const};, opt, &b)
$defs.push(format("-DHAVE_CONST_%s", const.tr_cpp))
true
else
false
end
end