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author | ttate <ttate@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2002-06-10 18:23:39 +0000 |
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committer | ttate <ttate@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2002-06-10 18:23:39 +0000 |
commit | ceade7b9268e9620b123843afeb25a7136f8a576 (patch) | |
tree | 5934090e772e41a4b3f75a7744a031f4576d60b1 /ext/dl/doc/dl.txt | |
parent | 5c1bdda10cc0febcac126532cf6f3aac51c08271 (diff) |
bugfix.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2542 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'ext/dl/doc/dl.txt')
-rw-r--r-- | ext/dl/doc/dl.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/ext/dl/doc/dl.txt b/ext/dl/doc/dl.txt index 114baafcb7..9964c4e12f 100644 --- a/ext/dl/doc/dl.txt +++ b/ext/dl/doc/dl.txt @@ -59,6 +59,18 @@ to wrap the given PtrData object which is, for example, created by DL::malloc(). DL::malloc() is a function to allocate a memory by using the C library function malloc(). +We can define a callback using the module function "callback" as follows: + + module Foo + extend DL::Importable + def my_comp(str1,str2) + str1 <=> str2 + end + COMPARE = callback "int my_comp(char*,char*)" + end + +where Foo::COMPARE is a Symbol object which invokes the method "my_comp". + DL::Importable module is very useful. However, we sometimes encounter a case that we must directly use low-level functions such as dlsym(). In such case, we would use DL module functions. They are described in next section. |