CODEWITHSUNDEEP
matlab
Mercury
Mercury

Reputation: 1965

Inline condition fprintf function

At the begining of each of my function I pass a debug flag that is either true or false. I would like to create a function (possibly inline) that uses this flag and prints only if the value is set to true. e.g.:

fprintff = @(str) debug&fprintf(str)
...
...
fprintff(str); %will only print if debug is set to true

I know I can do it with fprintff(str,debug), but I want to use it without it.

No persistent or global!

Upvotes: 0

Views: 133

Answers (1)

jodag
jodag

Reputation: 22284

One possibility is to define the debug print function to rely on the short-circuiting of the && operator. This way fprintf is only evaluated when debug_flag == true at the moment the function is defined.

function foo(bar,debug_flag)
    debug_print = @(varargin) debug_flag && fprintf(1,varargin{:});
    ...
    debug_print('This only prints if debug_flag == true\n');
    ...
end

Upvotes: 1

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