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cs440-acg/ext/eigen/test/exceptions.cpp

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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2011 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+// Various sanity tests with exceptions:
+//  - no memory leak when a custom scalar type trow an exceptions
+//  - todo: complete the list of tests!
+
+#define EIGEN_STACK_ALLOCATION_LIMIT 100000000
+
+#include "main.h"
+
+struct my_exception
+{
+  my_exception() {}
+  ~my_exception() {}
+};
+    
+class ScalarWithExceptions
+{
+  public:
+    ScalarWithExceptions() { init(); }
+    ScalarWithExceptions(const float& _v) { init(); *v = _v; }
+    ScalarWithExceptions(const ScalarWithExceptions& other) { init(); *v = *(other.v); }
+    ~ScalarWithExceptions() {
+      delete v;
+      instances--;
+    }
+
+    void init() {
+      v = new float;
+      instances++;
+    }
+
+    ScalarWithExceptions operator+(const ScalarWithExceptions& other) const
+    {
+      countdown--;
+      if(countdown<=0)
+        throw my_exception();
+      return ScalarWithExceptions(*v+*other.v);
+    }
+    
+    ScalarWithExceptions operator-(const ScalarWithExceptions& other) const
+    { return ScalarWithExceptions(*v-*other.v); }
+    
+    ScalarWithExceptions operator*(const ScalarWithExceptions& other) const
+    { return ScalarWithExceptions((*v)*(*other.v)); }
+    
+    ScalarWithExceptions& operator+=(const ScalarWithExceptions& other)
+    { *v+=*other.v; return *this; }
+    ScalarWithExceptions& operator-=(const ScalarWithExceptions& other)
+    { *v-=*other.v; return *this; }
+    ScalarWithExceptions& operator=(const ScalarWithExceptions& other)
+    { *v = *(other.v); return *this; }
+  
+    bool operator==(const ScalarWithExceptions& other) const
+    { return *v==*other.v; }
+    bool operator!=(const ScalarWithExceptions& other) const
+    { return *v!=*other.v; }
+    
+    float* v;
+    static int instances;
+    static int countdown;
+};
+
+ScalarWithExceptions real(const ScalarWithExceptions &x) { return x; }
+ScalarWithExceptions imag(const ScalarWithExceptions & ) { return 0; }
+ScalarWithExceptions conj(const ScalarWithExceptions &x) { return x; }
+
+int ScalarWithExceptions::instances = 0;
+int ScalarWithExceptions::countdown = 0;
+
+
+#define CHECK_MEMLEAK(OP) {                                 \
+    ScalarWithExceptions::countdown = 100;                  \
+    int before = ScalarWithExceptions::instances;           \
+    bool exception_thrown = false;                         \
+    try { OP; }                              \
+    catch (my_exception) {                                  \
+      exception_thrown = true;                              \
+      VERIFY(ScalarWithExceptions::instances==before && "memory leak detected in " && EIGEN_MAKESTRING(OP)); \
+    } \
+    VERIFY(exception_thrown && " no exception thrown in " && EIGEN_MAKESTRING(OP)); \
+  }
+
+void memoryleak()
+{
+  typedef Eigen::Matrix<ScalarWithExceptions,Dynamic,1> VectorType;
+  typedef Eigen::Matrix<ScalarWithExceptions,Dynamic,Dynamic> MatrixType;
+  
+  {
+    int n = 50;
+    VectorType v0(n), v1(n);
+    MatrixType m0(n,n), m1(n,n), m2(n,n);
+    v0.setOnes(); v1.setOnes();
+    m0.setOnes(); m1.setOnes(); m2.setOnes();
+    CHECK_MEMLEAK(v0 = m0 * m1 * v1);
+    CHECK_MEMLEAK(m2 = m0 * m1 * m2);
+    CHECK_MEMLEAK((v0+v1).dot(v0+v1));
+  }
+  VERIFY(ScalarWithExceptions::instances==0 && "global memory leak detected in " && EIGEN_MAKESTRING(OP)); \
+}
+
+void test_exceptions()
+{
+  EIGEN_TRY {
+    CALL_SUBTEST( memoryleak() );
+  } EIGEN_CATCH(...) {}
+}