From 76be75431badf02d735e26c5c422d2ee28645556 Mon Sep 17 00:00:00 2001
From: Joseph Lenox <lenox.joseph@gmail.com>
Date: Sat, 17 Nov 2018 20:57:03 -0600
Subject: [PATCH] Preset::config() returns a weak reference to the shared
 configuration.

---
 src/GUI/Preset.cpp          | 5 +++++
 src/GUI/Preset.hpp          | 3 +++
 xs/src/libslic3r/Config.hpp | 1 +
 3 files changed, 9 insertions(+)

diff --git a/src/GUI/Preset.cpp b/src/GUI/Preset.cpp
index bc0a66013..ec535aae7 100644
--- a/src/GUI/Preset.cpp
+++ b/src/GUI/Preset.cpp
@@ -44,6 +44,11 @@ Slic3r::Config Preset::dirty_config() {
     return result;
 }
 
+config_ref Preset::config() {
+    std::weak_ptr<Slic3r::Config> result { this->_dirty_config };
+    return result;
+}
+
 config_ptr Preset::load_config() {
     if (this->loaded()) return this->_dirty_config;
 
diff --git a/src/GUI/Preset.hpp b/src/GUI/Preset.hpp
index 0f4952779..e6410c75e 100644
--- a/src/GUI/Preset.hpp
+++ b/src/GUI/Preset.hpp
@@ -78,6 +78,9 @@ public:
     /// Retrieve a copy of the loaded version of the configuration with any options applied.
     Slic3r::Config dirty_config(); 
 
+    /// Retrieve a shared (cast through a weak) pointer. 
+    config_ref config();
+
     /// Pass-through to Slic3r::Config, returns whether or not a config was loaded.
     bool loaded() { return !this->_config->empty(); }
 
diff --git a/xs/src/libslic3r/Config.hpp b/xs/src/libslic3r/Config.hpp
index ce3333c45..bed98e911 100644
--- a/xs/src/libslic3r/Config.hpp
+++ b/xs/src/libslic3r/Config.hpp
@@ -33,6 +33,7 @@ public:
 
 class Config;
 using config_ptr = std::shared_ptr<Config>;
+using config_ref = std::weak_ptr<Config>;
 
 class Config {
 public: