Can't break on exceptions in MSVC

I have an exception thrown from native code in Visual Studio 10. I've enabled breaking on throw for all exceptions in the debug->exceptions menu. It's a regular C++ std::runtime_error, no SEH or managed exceptions involved here. But the runtime won't break on throw. It also won't catch them- even though I explicitly caught runtime_errors, since I throw some. They're finally caught by the managed calling code. I put a breakpoint before the throw statement and I know which one is throwing and why- but still mystified as to why I can't break on it or catch it.

    try {
        //...
        std::for_each(...) {
            if (condition) {
                std::stringstream str;
                str << "Error: Unexpected end of file in file " << arg.first << "\n";
                str << "Unused tokens: \n";
                for(int i = 0; i < token_stack.size(); i++) {
                    auto ref = token_stack.top();
                    str << "    " << ref->contents << " at line " << ref->line << "\n";
                    token_stack.pop();
              开发者_如何学C  }
                throw std::runtime_error(str.str());
            }
        });
        //...
    }
    catch(const std::runtime_error& exception) {
        std::cout << exception.what() << std::endl;
        return;
    }

The function is eventually called from managed code. I know that this throw statement is the one throwing.

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If this is a managed appliaction as you seem to imply, then I think you need to enable "mixed mode debugging". Have you checked if you can set a breakpoint in this function?