STL exceptions are not thrown Visual Studio 2015 Community Edition

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This code should definitely throw "vector subscript out of range" exception with a pop-up dialog. But absolutely nothing happens.

std::vector<int> x;
for (int i = 0; i < 4; ++i)
    x.pop_back();

I tried enabling C++ exceptions through Debug->Windows->Exception Settings but it didn't help ...

What could cause this ??

Why exceptions are disabled in Visual studio 2015 ?

Edit: My question remains the same but for this code:

std::vector<int> x;
std::cout << x.at(3) << '\n';

Edit 2 Full code:

#include <iostream>
#include <vector>

int main()
{
    std::vector<int> x;
    x.at(3) = 123;
    return 0;
}

nothing thrown, but reference says it should throw

Why does pop_back must throw exception?

Calling pop_back on an empty container is undefined.

So it's an Undefined behavior. Of course it needn't throw.

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There is a price to pay for C++ being fast and that means not everything can be checked at run-time. Expecially in loops a check on every access would slow things down.

You can use debug versions of the library (if the compiler supports them) and those should complain about bad accesses. Otherwise some compilers support memory checking flags to detect out of bounds accesses at compile time.

You can (and I would suggest should) check boundaries using assert() (or similar) which only checks debug builds and has a zero cost in the release version.

Manage exceptions with the debugger, If you select an exception in the Exception Settings window, debugger execution will break wherever the exception is thrown, no matter whether  Visual Studio 2015 break on unhandled exceptions not working. Visual studio used to have a specific checkbox to "Break on Un-handled exception". In 2015 this has been removed (or moved somewhere I cannot find it). So now my converted projects no longer break if I fail to provide a user-level exception handler.

The project is building with a different runtime library for linking.

Solution: C/C++ -> Code Generation-> Runtime Library : changed to Multi-threaded Debug(/MTd)

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Comments
  • Can't see that pop_back() is supposed to throw anything. The reference says "Exceptions: (none)".
  • And this clearly states it causes UB if the vector is empty.
  • The at(3) throws an exception for me. Can you post the whole code that doesn't throw?
  • @ampawd You still haven't added try/catch blocks to your code. And are you sure this is the code you are executing? Add a print statement before the putative invalid access to make sure.
  • "that runtime dialog box" is a question about the interaction between C++ programs that throw exceptions and Windows. To see whether an exception is being thrown, catch it. Once you've determined that the exception is being thrown, you can try to figure out why the Windows runtime mechanism isn't telling you that that happened.