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a comment about the new saving procedure

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This commit is contained in:
Paul Licameli 2017-10-21 12:51:46 -04:00
parent c1d1bee6b1
commit 15a1fa14e9
1 changed files with 17 additions and 0 deletions
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src/DirManager.cpp
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@ -577,6 +577,23 @@ bool DirManager::SetProject(wxString& newProjPath, wxString& newProjName, const
// Commit changes to filenames in the BlockFile objects, and removal // Commit changes to filenames in the BlockFile objects, and removal
// of files at old paths, ONLY NOW! This must be nothrow. // of files at old paths, ONLY NOW! This must be nothrow.
// This copy-then-delete procedure is needed to make it safe to
// attempt save to another storage device, but fail.
// It has the consequence that saving a project from one part of
// the device to another will not succeed unless there is sufficient
// space to hold originals and copies at the same time. Perhaps the
// extra cautions are not needed in that case, and the old procedure
// of renaming first, and reversing the renamings in case of failure,
// could still work safely.
// But I don't know whether wxWidgets gives us a reliable means to
// distinguish that case.
// I will err on the side of safety and simplicity and follow the
// same procedure in all cases.
size_t ii = 0; size_t ii = 0;
for (const auto &pair : mBlockFileHash) for (const auto &pair : mBlockFileHash)
{ {