debug/panic: use fmt for `unhandled` messages

CMakeLists.txt

@@ -10,7 +10,7 @@ include (search_libs)
 
 find_package (PythonInterp 3 REQUIRED)
 find_package (RAGEL 6.9 REQUIRED)
-
+find_package (fmt REQUIRED)
 
 if (WIN32)
     # Enable features for Windows Vista and higher
@@ -38,7 +38,7 @@ include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 ###############################################################################
 add_library(cruft)
 
-target_link_libraries(cruft ${NC_CXX_STDCXXFS})
+target_link_libraries(cruft ${NC_CXX_STDCXXFS} fmt::fmt)
 
 
 # Setup a directory to hold built sources we may need to export to clients.

debug/panic.hpp

@@ -8,8 +8,9 @@
 
 #pragma once
 
+#include <fmt/format.h>
+
 #include <type_traits>
-#include <sstream>
 #include <utility>
 
 
@@ -127,9 +128,7 @@ namespace cruft::debug::detail {
         if constexpr (std::is_enum_v<base_type>) {
             unhandled (static_cast<std::underlying_type_t<base_type>> (t));
         } else {
-            std::ostringstream os;
-            os << "unhandled value: " << t << '\n';
-            ::panic (os.str ());
+            ::panic (fmt::format ("unhandled value: {}", t));
         }
     }
 }

quaternion.cpp

@@ -13,6 +13,8 @@
 #include "vector.hpp"
 #include "coord/ops.hpp"
 
+#include <ostream>
+
 
 ///////////////////////////////////////////////////////////////////////////////
 using cruft::quaternion;

version.cpp.rl

@@ -8,12 +8,13 @@
 
 #include "version.hpp"
 #include "maths.hpp"
+#include "debug/assert.hpp"
 #include "debug/panic.hpp"
 
-#include <cstring>
 #include <stdexcept>
+#include <ostream>
 
-#include "debug/assert.hpp"
+#include <cstring>
 
 // We generate some really old style C code via ragel here, so we have to
 // disable some noisy warnings (doubly so given -Werror)