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authorLudovic Courtès <ludo@gnu.org>2017-04-15 23:53:23 +0200
committerLudovic Courtès <ludo@gnu.org>2017-04-16 00:48:08 +0200
commit1bb895eabf74a1e571887eb1521915e668a5c28d (patch)
tree7e8e5210a8c3f26d07ac46992f05740430436fe5 /gnu/services/dict.scm
parentf816dba680124860022ba155cf5a6a337739ef11 (diff)
services: Service types can now specify a default value for instances.
* gnu/services.scm (&no-default-value): New variable. (<service-type>)[default-value]: New field. (<service>): Rename constructor from 'service' to 'make-service'. (service): New macro. (%service-with-default-value): New procedure. (&missing-value-service-error): New error condition. * tests/services.scm ("services, default value"): New test. * doc/guix.texi (Service Types and Services): Document 'default-value'. (Service Reference): Explain default values.
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