diff --git a/instance.cpp b/instance.cpp
index 5013bf1..cf54e01 100644
--- a/instance.cpp
+++ b/instance.cpp
@@ -83,17 +83,14 @@ instance::instance (const create_info_t &info):
 std::set<std::string>
 instance::extensions (void) const
 {
-    uint32_t expected = 0;
-    error::try_code (vkEnumerateInstanceExtensionProperties (nullptr, &expected, nullptr));
+    auto values = error::try_values (
+        vkEnumerateInstanceExtensionProperties, nullptr
+    );
 
-    VkExtensionProperties props[expected];
-    uint32_t found = expected;
-    error::try_code (vkEnumerateInstanceExtensionProperties (nullptr, &found, props));
-
-    std::set<std::string> ext;
-    for (const auto &i: props)
-        ext.insert (i.extensionName);
-    return ext;
+    std::set<std::string> strings;
+    for (const auto &i: values)
+        strings.insert (i.extensionName);
+    return strings;
 }
 
 
@@ -101,11 +98,5 @@ instance::extensions (void) const
 std::vector<VkLayerProperties>
 instance::available_layers (void)
 {
-
-    uint32_t count;
-    vk::error::try_code (vkEnumerateInstanceLayerProperties (&count, nullptr));
-
-    std::vector<VkLayerProperties> layers (count);
-    vk::error::try_code (vkEnumerateInstanceLayerProperties (&count, layers.data ()));
-    return layers;
+    return error::try_values (vkEnumerateInstanceLayerProperties);
 }
diff --git a/physical_device.cpp b/physical_device.cpp
index 85e9b7e..1c9f136 100644
--- a/physical_device.cpp
+++ b/physical_device.cpp
@@ -27,19 +27,17 @@ using cruft::vk::physical_device;
 std::set<std::string>
 physical_device::extensions (void) const
 {
-    uint32_t expected = 0;
-    error::try_code (vkEnumerateDeviceExtensionProperties (native (), nullptr, &expected, nullptr));
+    auto values = error::try_values (
+        vkEnumerateDeviceExtensionProperties, native (), nullptr
+    );
 
-    VkExtensionProperties props[expected];
-    uint32_t found = expected;
-    error::try_code (vkEnumerateDeviceExtensionProperties (native (), nullptr, &found, props));
-
-    std::set<std::string> ext;
-    for (const auto &i: props)
-        ext.insert (i.extensionName);
-    return ext;
+    std::set<std::string> strings;
+    for (const auto &i: values)
+        strings.emplace (i.extensionName);
+    return strings;
 }
 
+
 ///////////////////////////////////////////////////////////////////////////////
 VkPhysicalDeviceProperties
 physical_device::properties (void) const