diff options
| author | Boris Kolpackov <boris@codesynthesis.com> | 2018-06-28 09:44:15 +0200 |
|---|---|---|
| committer | Boris Kolpackov <boris@codesynthesis.com> | 2018-06-28 09:44:15 +0200 |
| commit | 3cc5e3bd441fc9d18fece3d9e99fae75c78438e7 (patch) | |
| tree | a9a08c453370847e0d352d47e19fbfcb7cc757ef /build2/variable.hxx | |
| parent | c0f72d47fc25981dcc1f55e12dfa0fdba7b70242 (diff) | |
Implement support for excluded and ad hoc prerequisites
The inclusion/exclusion is controlled via the 'include' prerequisite-specific
variable. Valid values are:
false - exclude
true - include
adhoc - include but treat as an ad hoc input
For example:
lib{foo}: cxx{win32-utility}: include = ($cxx.targe.class == 'windows')
exe{bar}: libs{plugin}: include = adhoc
Diffstat (limited to 'build2/variable.hxx')
| -rw-r--r-- | build2/variable.hxx | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/build2/variable.hxx b/build2/variable.hxx index 808efc9..4d11b25 100644 --- a/build2/variable.hxx +++ b/build2/variable.hxx @@ -330,6 +330,13 @@ namespace build2 template <typename T> const T& cast_empty (const value&); template <typename T> const T& cast_empty (const lookup&); + // As above but returns the specified default if the value is NULL (or not + // defined, in case of lookup). Note that the return is by value, not by + // reference. + // + template <typename T> T cast_default (const value&, const T&); + template <typename T> T cast_default (const lookup&, const T&); + // As above but returns false/true if the value is NULL (or not defined, // in case of lookup). Note that the template argument is only for // documentation and should be bool (or semantically compatible). |