refactor(desktop): improve vector check

Author: Curve

modules/desktop/src/desktop.cpp

@@ -1,8 +1,10 @@
 #include "desktop.h"
 #include "app.impl.hpp"
 
-#include "utils/wide.hpp"
 #include "utils/range.hpp"
+#include "utils/traits.hpp"
+
+#include "utils/wide.hpp"
 #include "utils/opaque.hpp"
 
 #include <saucer/modules/desktop.hpp>
@@ -38,7 +40,7 @@ void pick(saucer_desktop *desktop, saucer_picker_options *opts, char *out, size_
 
     auto final = std::vector<char>{};
 
-    if constexpr (std::same_as<result_t, std::vector<saucer::fs::path>>)
+    if constexpr (saucer::bindings::container<result_t, std::vector>)
     {
         for (const auto &path : *result)
         {

private/utils/traits.hpp

@@ -0,0 +1,12 @@
+#pragma once
+
+namespace saucer::bindings
+{
+    template <typename T, template <typename...> typename C>
+    struct is_container;
+
+    template <typename T, template <typename...> typename C>
+    concept container = is_container<T, C>::value;
+} // namespace saucer::bindings
+
+#include "traits.inl"

private/utils/traits.inl

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "traits.hpp"
+
+#include <type_traits>
+
+namespace saucer::bindings
+{
+    template <typename T, template <typename...> typename C>
+    struct is_container : std::false_type
+    {
+    };
+
+    template <template <typename...> typename C, typename... Ts>
+    struct is_container<C<Ts...>, C> : std::true_type
+    {
+    };
+} // namespace saucer::bindings
+
+#include "traits.inl"