6b361bf050
This works by transferring ownership of the underlying C++ memory from the target language proxy class to an instance of the unique_ptr which is passed to the wrapped function via std::move. The proxy class has a new swigRelease() method which sets the underlying C++ pointer for the proxy class to null, so working in much the same way as std::unique_ptr::release(). Any attempt at using the proxy class will be the same as if the delete() function has been called on the proxy class. That is, using a C++ null pointer, when a non-null pointer is usually expected. This commit relies on the previous commit that uses std::move on the temporary variable used for the wrapped function's input parameter as std::unique_ptr is not copyable, it has move-only semantics.
102 lines
3.4 KiB
Java
102 lines
3.4 KiB
Java
import cpp11_std_unique_ptr.*;
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public class cpp11_std_unique_ptr_runme {
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static {
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try {
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System.loadLibrary("cpp11_std_unique_ptr");
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} catch (UnsatisfiedLinkError e) {
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System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
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System.exit(1);
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}
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}
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private static void WaitForGC()
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{
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System.gc();
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System.runFinalization();
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try {
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java.lang.Thread.sleep(10);
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} catch (java.lang.InterruptedException e) {
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}
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}
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private static void checkCount(int expected_count) {
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int actual_count = Klass.getTotal_count();
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if (actual_count != expected_count)
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throw new RuntimeException("Counts incorrect, expected:" + expected_count + " actual:" + actual_count);
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}
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public static void main(String argv[]) throws Throwable
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{
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// unique_ptr as input
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{
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Klass kin = new Klass("KlassInput");
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checkCount(1);
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String s = cpp11_std_unique_ptr.takeKlassUniquePtr(kin);
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checkCount(0);
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if (!s.equals("KlassInput"))
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throw new RuntimeException("Incorrect string: " + s);
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if (!cpp11_std_unique_ptr.is_nullptr(kin))
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throw new RuntimeException("is_nullptr failed");
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kin.delete(); // Should not fail, even though already deleted
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checkCount(0);
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}
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{
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KlassInheritance kini = new KlassInheritance("KlassInheritanceInput");
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checkCount(1);
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String s = cpp11_std_unique_ptr.takeKlassUniquePtr(kini);
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checkCount(0);
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if (!s.equals("KlassInheritanceInput"))
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throw new RuntimeException("Incorrect string: " + s);
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if (!cpp11_std_unique_ptr.is_nullptr(kini))
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throw new RuntimeException("is_nullptr failed");
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kini.delete(); // Should not fail, even though already deleted
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checkCount(0);
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}
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// unique_ptr as output
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Klass k1 = cpp11_std_unique_ptr.makeKlassUniquePtr("first");
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if (!k1.getLabel().equals("first"))
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throw new RuntimeException("wrong object label");
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Klass k2 = cpp11_std_unique_ptr.makeKlassUniquePtr("second");
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if (Klass.getTotal_count() != 2)
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throw new RuntimeException("number of objects should be 2");
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k1 = null;
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{
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int countdown = 500;
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int expectedCount = 1;
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while (true) {
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WaitForGC();
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if (--countdown == 0)
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break;
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if (Klass.getTotal_count() == expectedCount)
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break;
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}
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int actualCount = Klass.getTotal_count();
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if (actualCount != expectedCount)
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System.err.println("GC failed to run (cpp11_std_unique_ptr 1). Expected count: " + expectedCount + " Actual count: " + actualCount); // Finalizers are not guaranteed to be run and sometimes they just don't
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}
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if (!k2.getLabel().equals("second"))
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throw new RuntimeException("wrong object label");
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k2 = null;
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{
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int countdown = 500;
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int expectedCount = 0;
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while (true) {
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WaitForGC();
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if (--countdown == 0)
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break;
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if (Klass.getTotal_count() == expectedCount)
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break;
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};
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int actualCount = Klass.getTotal_count();
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if (actualCount != expectedCount)
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System.err.println("GC failed to run (cpp11_std_unique_ptr 2). Expected count: " + expectedCount + " Actual count: " + actualCount); // Finalizers are not guaranteed to be run and sometimes they just don't
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}
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}
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}
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