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precompiled headers?

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Can someone explain to me what a precompiled header is and how it differs from a normal header? The more info the better(when it''s good to use, when not...) Thanks J

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Precompiled headers are there to make build times quicker by reducing the amount of files to recompile after you have made changes to your header files as all source files which #include the edited header get recompiled even if the changes made have nothing to do with that file. This what PCHs are there for.

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