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authorKarl Berry <karl@freefriends.org>2017-03-07 18:10:02 +0000
committerKarl Berry <karl@freefriends.org>2017-03-07 18:10:02 +0000
commita6dc131e8a2ff8ce660543a262d771380fdf1b4e (patch)
tree33ab70fd89ae0842cedcfce676aaa6d64a9eb7dc /Build/source/utils/asymptote/doc/asymptote.texi
parent78cc0e8d7d1977f9cf5c8c9ba3d9de81ed6e03a3 (diff)
asy 2.40 sources
git-svn-id: svn://tug.org/texlive/trunk@43422 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/utils/asymptote/doc/asymptote.texi')
-rw-r--r--Build/source/utils/asymptote/doc/asymptote.texi13
1 files changed, 12 insertions, 1 deletions
diff --git a/Build/source/utils/asymptote/doc/asymptote.texi b/Build/source/utils/asymptote/doc/asymptote.texi
index 47b67a23736..0c7d92a297a 100644
--- a/Build/source/utils/asymptote/doc/asymptote.texi
+++ b/Build/source/utils/asymptote/doc/asymptote.texi
@@ -5733,6 +5733,16 @@ real[] a={2.5,-3.5};
int[] b=(int []) a;
write(stdout,b); // Outputs 2,-3
@end verbatim
+In situations where casting from a string to a type @code{T} fails,
+an uninitialized variable is returned; this condition can be detected
+with the function @code{bool initialized(T);}
+@verbatim
+int i=(int) "2.5";
+assert(initialized(i),"Invalid cast.");
+
+real x=(real) "2.5a";
+assert(initialized(x),"Invalid cast.");
+@end verbatim
@cindex @code{operator cast}
Casting to user-defined types is also possible using @code{operator cast}:
@@ -5760,6 +5770,7 @@ straightforward implementation
@verbatim
real operator cast(int x) {return x*100;}
@end verbatim
+@noindent
is equivalent to an infinite recursion, since the result @code{x*100}
needs itself to be cast from an integer to a real. Instead, we want to
use the standard conversion of int to real:
@@ -6095,7 +6106,7 @@ to the type. This is regardless of what fields the variable actually possesses.
@cindex @code{asymptote.sty}
@code{Asymptote} comes with a convenient @code{LaTeX} style file
-@code{asymptote.sty} (v1.30 or later required) that makes @code{LaTeX}
+@code{asymptote.sty} (v1.33 or later required) that makes @code{LaTeX}
@code{Asymptote}-aware. Entering @code{Asymptote} code
directly into the @code{LaTeX} source file, at the point where it is
needed, keeps figures organized and avoids the need to invent new file