[llvm-commits] [PATCH] [lld][ErrorOr] Add support for user data.

[Michael Spencer]

Hi jordan_rose, silvas,

This adds support for user data to ErrorOr<T>.

struct InvalidArgError {
  InvalidArgError() {}
  InvalidArgError(std::string S) : ArgName(S) {}
  std::string ArgName;
};

namespace lld {
template<>
struct ErrorOrUserDataTraits<InvalidArgError> : std::true_type {
  static error_code error() {
    return make_error_code(errc::invalid_argument);
  }
};
} // end namespace lld

using namespace lld;

ErrorOr<int> foo() {
  return InvalidArgError("adena");
}

int main() {
  auto a = foo();
  if (!a && error_code(a) == errc::invalid_argument)
    llvm::errs() << a.getError<InvalidArgError>().ArgName << "\n";
}

http://llvm-reviews.chandlerc.com/D213

Files:
  CMakeLists.txt
  include/lld/Core/ErrorOr.h
  unittests/CMakeLists.txt
  unittests/ErrorOrTest.cpp
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D213.1.patch
Type: text/x-patch
Size: 14199 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20121212/e5659d4e/attachment.bin>