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% File src/library/base/man/ns-topenv.Rd
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% File src/library/base/man/ns-topenv.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 1995-2019 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-topenv}
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\name{ns-topenv}
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\title{Top Level Environment}
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\title{Top Level Environment}
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\alias{topenv}
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\alias{topenv}
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  \item{matchThisEnv}{return this environment, if it matches before
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  \item{matchThisEnv}{return this environment, if it matches before
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      any other criterion is satisfied.  The default, the option
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      any other criterion is satisfied.  The default, the option
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      \samp{topLevelEnvironment}, is set by \code{\link{sys.source}},
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      \samp{topLevelEnvironment}, is set by \code{\link{sys.source}},
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      which treats a specific environment as the top level environment.
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      which treats a specific environment as the top level environment.
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      Supplying the argument as \code{NULL} means it will never match.}
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      Supplying the argument as \code{NULL} or \code{emptyenv()} means
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      it will never match.}
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}
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}
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\details{
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\details{
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  \code{topenv} returns the first top level \code{\link{environment}}
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  \code{topenv} returns the first top level \code{\link{environment}}
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  found when searching \code{envir} and its enclosing environments.  An
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  found when searching \code{envir} and its enclosing environments. If no
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  top level environment is found, \code{\link{.GlobalEnv}} is returned.  An
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  environment is considered top level if it is the internal environment
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  environment is considered top level if it is the internal environment
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  of a namespace, a package environment in the \code{\link{search}}
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  of a namespace, a package environment in the \code{\link{search}}
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  path, or \code{\link{.GlobalEnv}} .
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  path, or \code{\link{.GlobalEnv}} .
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}
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}
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\seealso{
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\seealso{