Compiler Error C2712
cannot use __try in functions that require object unwinding
When you use /EHsc, a function with structured exception handling cannot have objects that require unwinding (destruction).
Possible solutions:
Move code that requires SEH to another function
Rewrite functions that use SEH to avoid the use of local variables and parameters that have destructors. Do not use SEH in constructors or destructors
Compile without /EHsc
Error C2712 can also occur if you call a method declared by using the __event keyword. Because the event might be used in a multithreaded environment, the compiler generates code that prevents manipulation of the underlying event object, and then encloses the generated code in an SEH try-finally statement. Consequently, error C2712 will occur if you call the event method and pass by value an argument whose type has a destructor. One solution in this case is to pass the argument as a constant reference.
Example
C2712 can occur if you compile with /clr:pure and declare a static array of pointers-to-functions in a __try block. A static member requires the compiler to use dynamic initialization under /clr:pure, which implies C++ exception handling. However, C++ exception handling is not allowed in a __try block.
The following sample generates C2712.
// C2712.cpp
// compile with: /clr:pure /c
struct S1 {
static int smf();
void fnc();
};
void S1::fnc() {
__try {
static int (*array_1[])() = {smf,}; // C2712
// OK
static int (*array_2[2])();
array_2[0] = smf;
}
__except(0) {}
}