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% File src/library/base/man/ns-hooks.Rd
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% File src/library/base/man/ns-hooks.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2015 R Core Team
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% Copyright 1995-2017 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{ns-hooks}
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\name{ns-hooks}
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\alias{.onLoad}
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\alias{.onLoad}
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\alias{.onUnload}
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\alias{.onUnload}
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When the package is attached (via \code{\link{library}} or
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When the package is attached (via \code{\link{library}} or
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\code{\link{attachNamespace}}), the hook function \code{.onAttach} is
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\code{\link{attachNamespace}}), the hook function \code{.onAttach} is
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looked for and if found is called (with two unnamed arguments) before
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looked for and if found is called (with two unnamed arguments) before
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the package environment is sealed.
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the package environment is sealed.
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If a function \code{.onDetach} (as from \R 3.0.0) is in the namespace
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If a function \code{.onDetach} is in the namespace or \code{.Last.lib}
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or \code{.Last.lib} is exported from the package, it will be called
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is exported from the package, it will be called (with a single
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(with a single argument) when the package is \code{\link{detach}}ed.
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argument) when the package is \code{\link{detach}}ed. Beware that it
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Beware that it might be called if \code{.onAttach} has failed, so it should be
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might be called if \code{.onAttach} has failed, so it should be
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written defensively. (It is called within \code{\link{tryCatch}}, so
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written defensively. (It is called within \code{\link{tryCatch}}, so
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errors will not stop the package being detached.)
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errors will not stop the package being detached.)
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If a namespace is unloaded (via \code{\link{unloadNamespace}}), a hook
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If a namespace is unloaded (via \code{\link{unloadNamespace}}), a hook
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function \code{.onUnload} is run (with a single argument) before final
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function \code{.onUnload} is run (with a single argument) before final
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