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 under /clr 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");
}
}