Lang Hames 034e76c90d [Support] Add ExitOnError utility to support tools that use the exit-on-error ... idiom. Most LLVM tool code exits immediately when an error is encountered and prints an error message to stderr. The ExitOnError class supports this by providing two call operators - one for Errors, and one for Expected<T>s. Calls to code that can return Errors (or Expected<T>s) can use these calls to bail out on error, and otherwise continue as if the operation had succeeded. E.g. Error foo(); Expected<int> bar(); int main(int argc, char *argv[]) { ExitOnError ExitOnErr; ExitOnErr.setBanner(std::string("Error in ") + argv[0] + ":"); // Exit if foo returns an error. No need to manually check error return. ExitOnErr(foo()); // Exit if bar returns an error, otherwise unwrap the contained int and // continue. int X = ExitOnErr(bar()); // ... return 0; } llvm-svn: 263749		2016-03-17 21:28:49 +00:00
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llvm	[Support] Add ExitOnError utility to support tools that use the exit-on-error	2016-03-17 21:28:49 +00:00
llvm-c	Use templated version of unwrap instead of cats in the Core.cpp. NFC	2016-03-13 00:54:40 +00:00