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Provide a "None" value for convenience when using Optional<T>()

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This implementation of NoneType/None does have some holes but I haven't
found one that doesn't - open to improvement.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175696 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2013-02-21 00:27:28 +00:00
parent 06ab2c828a
commit 5c43245bf4
3 changed files with 31 additions and 2 deletions
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4
lib/Support/LockFileManager.cpp
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@ -31,7 +31,7 @@ LockFileManager::readLockFile(StringRef LockFileName) {
// to read, so we just return.
bool Exists = false;
if (sys::fs::exists(LockFileName, Exists) || !Exists)
return Optional<std::pair<std::string, int> >();
return None;
// Read the owning host and PID out of the lock file. If it appears that the
// owning process is dead, the lock file is invalid.
@ -45,7 +45,7 @@ LockFileManager::readLockFile(StringRef LockFileName) {
// Delete the lock file. It's invalid anyway.
bool Existed;
sys::fs::remove(LockFileName, Existed);
return Optional<std::pair<std::string, int> >();
return None;
}
bool LockFileManager::processStillExecuting(StringRef Hostname, int PID) {