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由 Entong Shen 提交于
This commit eliminates the global new/delete overrides that were causing compatibility problems (the Allocators.(h/cpp/inl) files have been completely removed). The GPOS `New()` macro is retained and works the same way, but has been renamed `GPOS_NEW()` to avoid confusion and possible name collisions. `GPOS_NEW()` works only for allocating singleton objects. For allocating arrays, `GPOS_NEW_ARRAY()` is provided. Because we no longer override the global delete, objects/arrays allocated by `GPOS_NEW()` and `GPOS_NEW_ARRAY()` must now be deleted by the new functions `GPOS_DELETE()` and `GPOS_DELETE_ARRAY()` respectively. All code in GPOS has been retrofitted for these changes, but Orca and other code that depends on GPOS should also be changed. Note that `GPOS_NEW()` and `GPOS_NEW_ARRAY()` should both be exception-safe and not leak memory when a constructor throws. Closes #166
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