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function resultFlag = IsOSX(is64)
% resultFlag = IsOSX([is64=0])
%
% Returns true if the operating system is macOS.
% If the optional 'is64' flag is set to one, returns
% true if the runtime is 64 bit and on macOS.
%
% See also: IsWin, IsLinux, OSName, computer
% HISTORY
% ??/??/?? awi Wrote it.
% 06/30/06 awi Fixed help section.
% 04/30/12 mk Support 64-Bit OS/X.
% 12/16/23 mk Simplify.
persistent rc;
persistent rc64;
% check input
if nargin < 1 || isempty(is64)
is64 = 0;
end
if isempty(rc)
rc = ismac;
end
if isempty(rc64)
rc64 = rc && Is64Bit;
end
if is64 == 0
resultFlag = rc;
else
resultFlag = rc64;
end
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