[LLVMbugs] [Bug 20407] Segmentation fault involving std::initializer_list <std::pair <std::string, int>>

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20407

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #6 from Richard Smith <richard-llvm at metafoo.co.uk> ---
Oh, I see. Yes, I can reproduce the crash; it's a bug in your code. This:

    std::initializer_list<std::pair<std::string, int>> values({{"0", 0}, {"1",
1}, {"2", 2}});

... creates a temporary std::initializer_list object (the {...}), then passes
it as an argument to the constructor of 'values'. The underlying array is not
lifetime-extended, so you're referring to an element of the array after it's
destroyed.

Deleting the parens results in the array being lifetime-extended, so it works.


Think of it like this:

struct init_list {
  std::pair<std::string, int> (&&values)[2];
};

init_list values(init_list{{{"0", 0}, {"1", 1}, {"2", 2}}}); // does not
lifetime-extend array temporary
init_list values{{{"0", 0}, {"1", 1}, {"2", 2}}}; // lifetime-extends array
temporary

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