--- a/libirccd-core/irccd/config.cpp	Mon Jul 09 20:53:00 2018 +0200
+++ b/libirccd-core/irccd/config.cpp	Mon Jul 09 21:02:00 2018 +0200
@@ -18,13 +18,12 @@
 
 #include <boost/filesystem.hpp>
 
-#include <irccd/system.hpp>
-
 #include "config.hpp"
+#include "system.hpp"
 
 namespace irccd {
 
-boost::optional<config> config::search(const std::string& name)
+auto config::search(std::string_view name) -> std::optional<config>
 {
     for (const auto& path : sys::config_filenames(name)) {
         boost::system::error_code ec;
@@ -33,7 +32,18 @@
             return config(path);
     }
 
-    return boost::optional<config>();
+    return std::nullopt;
+}
+
+config::config(std::string path)
+    : document(path.empty() ? ini::document() : ini::read_file(path))
+    , path_(std::move(path))
+{
+}
+
+auto config::get_path() const noexcept -> const std::string&
+{
+    return path_;
 }
 
 } // !irccd

--- a/libirccd-core/irccd/config.hpp	Mon Jul 09 20:53:00 2018 +0200
+++ b/libirccd-core/irccd/config.hpp	Mon Jul 09 21:02:00 2018 +0200
@@ -24,7 +24,8 @@
  * \brief Read .ini configuration file for irccd
  */
 
-#include <boost/optional.hpp>
+#include <optional>
+#include <string_view>
 
 #include "ini.hpp"
 
@@ -44,28 +45,21 @@
      * \param name the file name
      * \return the config or empty if not found
      */
-    static boost::optional<config> search(const std::string& name);
+    static auto search(std::string_view name) -> std::optional<config>;
 
     /**
      * Load the configuration from the specified path.
      *
      * \param path the path
      */
-    inline config(std::string path = "")
-        : document(path.empty() ? ini::document() : ini::read_file(path))
-        , path_(std::move(path))
-    {
-    }
+    config(std::string path = "");
 
     /**
      * Get the path to the configuration file.
      *
      * \return the path
      */
-    inline const std::string& get_path() const noexcept
-    {
-        return path_;
-    }
+    auto get_path() const noexcept -> const std::string&;
 };
 
 } // !irccd

--- a/libirccd-core/irccd/system.cpp	Mon Jul 09 20:53:00 2018 +0200
+++ b/libirccd-core/irccd/system.cpp	Mon Jul 09 21:02:00 2018 +0200
@@ -468,11 +468,14 @@
 
 // {{{ config_filenames
 
-std::vector<std::string> config_filenames(std::string file)
+std::vector<std::string> config_filenames(std::string_view file)
 {
+    // TODO: remove this once we can use std::filesystem.
+    const std::string filename(file);
+
     return {
-        (user_config_directory() / file).string(),
-        (sysconfdir() / file).string()
+        (user_config_directory() / filename).string(),
+        (sysconfdir() / filename).string()
     };
 }
 

--- a/libirccd-core/irccd/system.hpp	Mon Jul 09 20:53:00 2018 +0200
+++ b/libirccd-core/irccd/system.hpp	Mon Jul 09 21:02:00 2018 +0200
@@ -26,6 +26,7 @@
 
 #include <cstdint>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include <boost/filesystem.hpp>
@@ -148,7 +149,7 @@
  * \param file the filename to append for convenience
  * \return the list of paths to check in order
  */
-std::vector<std::string> config_filenames(std::string file);
+std::vector<std::string> config_filenames(std::string_view file);
 
 /**
  * Construct a list of paths for reading plugins.