From 57abb0703ec640fdcd0b0ac165f742bbc34df533 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 14 Jun 2017 13:06:38 +0200
Subject: Next installment in C++ modules saga: module search, re-export
 support

---
 build2/algorithm.hxx | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

(limited to 'build2/algorithm.hxx')

diff --git a/build2/algorithm.hxx b/build2/algorithm.hxx
index 9f54c8d..49ca7a7 100644
--- a/build2/algorithm.hxx
+++ b/build2/algorithm.hxx
@@ -307,7 +307,8 @@ namespace build2
   //
   // The filter is passed each prerequisite target and is expected to signal
   // which ones should be used for timestamp comparison. If the filter is
-  // NULL, then all the prerequisites are used.
+  // NULL, then all the prerequisites are used. If the count is not 0, then
+  // only the first count prerequisites are executed.
   //
   // Note that the return value is an optional target state. If the target
   // needs updating, then the value absent. Otherwise it is the state that
@@ -327,7 +328,8 @@ namespace build2
   optional<target_state>
   execute_prerequisites (action, const target&,
                          const timestamp&,
-                         const prerequisite_filter& = nullptr);
+                         const prerequisite_filter& = nullptr,
+                         size_t count = 0);
 
   // Another version of the above that does two extra things for the caller:
   // it determines whether the action needs to be executed on the target based
@@ -340,20 +342,23 @@ namespace build2
   pair<optional<target_state>, const T&>
   execute_prerequisites (action, const target&,
                          const timestamp&,
-                         const prerequisite_filter& = nullptr);
+                         const prerequisite_filter& = nullptr,
+                         size_t count = 0);
 
   pair<optional<target_state>, const target&>
   execute_prerequisites (const target_type&,
                          action, const target&,
                          const timestamp&,
-                         const prerequisite_filter& = nullptr);
+                         const prerequisite_filter& = nullptr,
+                         size_t count = 0);
 
   template <typename T>
   pair<optional<target_state>, const T&>
   execute_prerequisites (const target_type&,
                          action, const target&,
                          const timestamp&,
-                         const prerequisite_filter& = nullptr);
+                         const prerequisite_filter& = nullptr,
+                         size_t count = 0);
 
   // Execute members of a group or similar prerequisite-like dependencies.
   // Similar in semantics to execute_prerequisites().
-- 
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