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Updated this example so that it shows how to pass arguments to threads
by reference using the ref() function. --HG-- extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403712
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@ -8,11 +8,13 @@
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45.6
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9.999
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I have no args!
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val: 3
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*/
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#include <iostream>
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#include "dlib/threads.h"
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#include "dlib/ref.h"
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using namespace dlib;
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using namespace std;
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@ -27,6 +29,11 @@ void thread_2 ()
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cout << "I have no args!" << endl;
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}
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void thread_increment(double& a)
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{
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a += 1;
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}
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int main()
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{
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// create a thread that will call thread_1(45.6)
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@ -45,6 +52,15 @@ int main()
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thread_function t3(thread_2);
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// Note that we can also use the ref() function to pass a variable
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// to a thread by reference. For example, the thread below adds
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// one to val.
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double val = 2;
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thread_function t4(thread_increment, ref(val));
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t4.wait(); // wait for t4 to finish before printing val.
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cout << "val: " << val << endl;
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// we will wait for t3 to end here because the destructor for
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// thread_function objects always waits for their thread to end
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