词条 | safe_cast |
释义 | safe_cast allows you to change the type of an expression and generate verifiable MSIL code. Example // safe_cast.cpp // compile with: /clr using namespace System; interface class I1 {}; interface class I2 {}; interface class I3 {}; ref class X : public I1, public I2 {}; int main() { I1^ i1 = gcnew X; I2^ i2 = safe_cast<I2^>(i1); // OK, I1 and I2 have common type: X // I2^ i3 = static_cast<I2^>(i1); C2440 use safe_cast instead try { I3^ i4 = safe_cast<I3^>(i1); // fail at runtime, no common type } catch(InvalidCastException^) { Console::WriteLine("Caught expected exception"); } } // Caught expected exception |
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