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authorMichael Shepanski <michael@codesynthesis.com>2014-10-30 15:35:44 +1100
committerMichael Shepanski <michael@codesynthesis.com>2014-10-31 08:37:00 +1100
commita3cf15ba206f5571342c829c06f6de1653928364 (patch)
treeaf8abad639965217fcafee83d8aeb712f5a9bab3 /reference/list
parent049ec20555c741861f69647a07d9ca707b2c5646 (diff)
Allow lambdas & std::functions as query factories with C++-98 builds of libodb
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diff --git a/reference/list b/reference/list
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@@ -11,3 +11,18 @@
* support via bool flag and make user instantiate - burdensome
* support via bool flag and instantiate stderr_full_tracer - code bloat
but seems the best option
+
++ C++11 support is not trully header only [c++11]
+
+ Added a new class details::function_wrapper<F>, which can be used similarly
+ to std::function<F>. In particular, C++11 code can construct a
+ function_wrapper from a lambda, or a std::function, or another
+ function_wrapper. But it differs from std::function in this respect:
+ C++98 code can declare and define function_wrapper objects.
+
+ Now all builds (98 or 11) of libodb keep their callbacks in
+ function_wrappers. C++11 user code can register std::functions or lambdas as
+ callbacks, and the glue that turns those into function_wrappers for libodb is
+ header-only.
+
+ This technique is currently used for data migrations and query factories.