From 29f8159583d2b02efa2afeaa58082f57222c943d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 3 Dec 2015 14:37:22 +0200
Subject: Add ability for module to remember that it is unconfigured

A module can set and then check the config.*.configured special variable
to false.
---
 build/variable | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'build/variable')

diff --git a/build/variable b/build/variable
index 5d0b175..51d748d 100644
--- a/build/variable
+++ b/build/variable
@@ -119,6 +119,8 @@ namespace build
     bool empty () const {return state_ == state_type::empty;}
 
     explicit operator bool () const {return !null ();}
+    bool operator== (std::nullptr_t) const {return null ();}
+    bool operator!= (std::nullptr_t) const {return !null ();}
 
     // Raw data read interface.
     //
-- 
cgit v1.1