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Compiler Error C2715

'type' : cannot throw or catch this type

Value types are not valid arguments when using exception handling in managed code (see Exception Handling (C++ Component Extensions) for more information).

// C2715a.cpp
// compile with: /clr
using namespace System;

value struct V {
   int i;
};

void f1() {
   V v;
   v.i = 10;
   throw v;   // C2715
   // try the following line instead
   // throw ((V^)v);
}

int main() {
   try {
      f1();
   }

   catch(V v) { if ( v.i == 10 ) {   // C2715
   // try the following line instead
   // catch(V^ pv) { if ( pv->i == 10 ) {
         Console::WriteLine("caught 10 - looks OK");
      } 
      else {
         Console::WriteLine("catch looks bad");
      }
   }
   catch(...) {
      Console::WriteLine("catch looks REALLY bad");
   }
}

__value types or __gc pointers are not valid arguments when using exception handling in Managed Extensions for C++. To resolve this error, use the __box keyword to box the argument.

The following sample generates C2715:

// C2715b.cpp
// compile with: /clr:oldSyntax
using namespace System;

__value struct V {
   int i;
};

void f1() {
   V v;
   v.i = 10;
   throw v;   // C2715
   // try the following line instead
   // throw __box(v);
}

int main() {
   try {
      f1();
   }

   catch(V v) { if ( v.i == 10 ) {   // C2715
   // try the following line instead
   // catch(__box V *pv) { if ( pv->i == 10 ) {
         Console::WriteLine(S"caught 10 - looks OK");
      } 
      else {
         Console::WriteLine(S"catch looks bad");
      }
   }
   catch(...) {
      Console::WriteLine(S"catch looks REALLY bad");
   }
}
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