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>Foreign.Marshal.Error</TITLE
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>base-4.2.0.2: Basic libraries</TD
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>Contents</A
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>Foreign.Marshal.Error</FONT
></TD
><TD ALIGN="right"
><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>portable</TD
></TR
><TR
><TD CLASS="infohead"
>Stability</TD
><TD CLASS="infoval"
>provisional</TD
></TR
><TR
><TD CLASS="infohead"
>Maintainer</TD
><TD CLASS="infoval"
>ffi@haskell.org</TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
>Routines for testing return values and raising a <TT
><A HREF="System-IO-Error.html#v%3AuserError"
>userError</A
></TT
> exception
in case of values indicating an error state.
</TD
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><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Synopsis</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="#v%3AthrowIf"
>throwIf</A
> :: (a -> <A HREF="Data-Bool.html#t%3ABool"
>Bool</A
>) -> (a -> <A HREF="Data-Char.html#t%3AString"
>String</A
>) -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AthrowIf_"
>throwIf_</A
> :: (a -> <A HREF="Data-Bool.html#t%3ABool"
>Bool</A
>) -> (a -> <A HREF="Data-Char.html#t%3AString"
>String</A
>) -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AthrowIfNeg"
>throwIfNeg</A
> :: (<A HREF="Data-Ord.html#t%3AOrd"
>Ord</A
> a, <A HREF="Prelude.html#t%3ANum"
>Num</A
> a) => (a -> <A HREF="Data-Char.html#t%3AString"
>String</A
>) -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AthrowIfNeg_"
>throwIfNeg_</A
> :: (<A HREF="Data-Ord.html#t%3AOrd"
>Ord</A
> a, <A HREF="Prelude.html#t%3ANum"
>Num</A
> a) => (a -> <A HREF="Data-Char.html#t%3AString"
>String</A
>) -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AthrowIfNull"
>throwIfNull</A
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> (<A HREF="Foreign-Ptr.html#t%3APtr"
>Ptr</A
> a) -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> (<A HREF="Foreign-Ptr.html#t%3APtr"
>Ptr</A
> a)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Avoid"
>void</A
> :: <A HREF="System-IO.html#t%3AIO"
>IO</A
> a -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Documentation</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:throwIf"
><A NAME="v%3AthrowIf"
></A
></A
><B
>throwIf</B
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="arg"
>:: a -> <A HREF="Data-Bool.html#t%3ABool"
>Bool</A
></TD
><TD CLASS="rdoc"
>error condition on the result of the <TT
><A HREF="System-IO.html#t%3AIO"
>IO</A
></TT
> action
</TD
></TR
><TR
><TD CLASS="arg"
>-> a -> <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
><TD CLASS="rdoc"
>computes an error message from erroneous results
of the <TT
><A HREF="System-IO.html#t%3AIO"
>IO</A
></TT
> action
</TD
></TR
><TR
><TD CLASS="arg"
>-> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
><TD CLASS="rdoc"
>the <TT
><A HREF="System-IO.html#t%3AIO"
>IO</A
></TT
> action to be executed
</TD
></TR
><TR
><TD CLASS="arg"
>-> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="ndoc" COLSPAN="2"
>Execute an <TT
><A HREF="System-IO.html#t%3AIO"
>IO</A
></TT
> action, throwing a <TT
><A HREF="System-IO-Error.html#v%3AuserError"
>userError</A
></TT
> if the predicate yields
<TT
><A HREF="Data-Bool.html#v%3ATrue"
>True</A
></TT
> when applied to the result returned by the <TT
><A HREF="System-IO.html#t%3AIO"
>IO</A
></TT
> action.
If no exception is raised, return the result of the computation.
</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:throwIf_"
><A NAME="v%3AthrowIf_"
></A
></A
><B
>throwIf_</B
> :: (a -> <A HREF="Data-Bool.html#t%3ABool"
>Bool</A
>) -> (a -> <A HREF="Data-Char.html#t%3AString"
>String</A
>) -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="doc"
>Like <TT
><A HREF="Foreign-Marshal-Error.html#v%3AthrowIf"
>throwIf</A
></TT
>, but discarding the result
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:throwIfNeg"
><A NAME="v%3AthrowIfNeg"
></A
></A
><B
>throwIfNeg</B
> :: (<A HREF="Data-Ord.html#t%3AOrd"
>Ord</A
> a, <A HREF="Prelude.html#t%3ANum"
>Num</A
> a) => (a -> <A HREF="Data-Char.html#t%3AString"
>String</A
>) -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>Guards against negative result values
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:throwIfNeg_"
><A NAME="v%3AthrowIfNeg_"
></A
></A
><B
>throwIfNeg_</B
> :: (<A HREF="Data-Ord.html#t%3AOrd"
>Ord</A
> a, <A HREF="Prelude.html#t%3ANum"
>Num</A
> a) => (a -> <A HREF="Data-Char.html#t%3AString"
>String</A
>) -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> a -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="doc"
>Like <TT
><A HREF="Foreign-Marshal-Error.html#v%3AthrowIfNeg"
>throwIfNeg</A
></TT
>, but discarding the result
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:throwIfNull"
><A NAME="v%3AthrowIfNull"
></A
></A
><B
>throwIfNull</B
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> (<A HREF="Foreign-Ptr.html#t%3APtr"
>Ptr</A
> a) -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> (<A HREF="Foreign-Ptr.html#t%3APtr"
>Ptr</A
> a)</TD
></TR
><TR
><TD CLASS="doc"
>Guards against null pointers
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:void"
><A NAME="v%3Avoid"
></A
></A
><B
>void</B
> :: <A HREF="System-IO.html#t%3AIO"
>IO</A
> a -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="doc"
>Discard the return value of an <TT
><A HREF="System-IO.html#t%3AIO"
>IO</A
></TT
> action
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
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>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
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