diff options
Diffstat (limited to 'libbuild2/config/utility.hxx')
| -rw-r--r-- | libbuild2/config/utility.hxx | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/libbuild2/config/utility.hxx b/libbuild2/config/utility.hxx index ee266f1..614791f 100644 --- a/libbuild2/config/utility.hxx +++ b/libbuild2/config/utility.hxx @@ -250,11 +250,53 @@ namespace build2 new_value, rs, var, string (default_value), save_flags, override); } + // Helper functions for assigning/appending config.x.y value to x.y, + // essentially: + // + // rs.assign (var) = lookup_config (rs, "config." + var, default_value); + // rs.append (var) += lookup_config (rs, "config." + var, default_value); + // + template <typename V, typename T> + inline const V* + assign_config (scope& rs, scope& bs, string var, T&& default_value) + { + const V* cv ( + cast_null<V> ( + lookup_config (rs, + rs.var_pool ().insert<V> ("config." + var), + std::forward<T> (default_value)))); // VC14 + + value& v (bs.assign<V> (move (var))); + + if (cv != nullptr) + v = *cv; + + return v.null ? nullptr : &v.as<V> (); + } + + template <typename V, typename T> + inline const V* + append_config (scope& rs, scope& bs, string var, T&& default_value) + { + const V* cv ( + cast_null<V> ( + lookup_config (rs, + rs.var_pool ().insert<V> ("config." + var), + std::forward<T> (default_value)))); // VC14 + + value& v (bs.append<V> (move (var))); + + if (cv != nullptr) + v += *cv; + + return v.null ? nullptr : &v.as<V> (); + } + // Check whether there are any variables specified from the config.<name> // namespace. The idea is that we can check if there are any, say, // config.install.* values. If there are none, then we can assume this // functionality is not (yet) used and omit writing a whole bunch of NULL - // config.install.* values to the config.build file. We call this + // config.install.* values to the config.build file. We call this // omitted/delayed configuration. // // Note that this function detects and ignores special config.* variables |