use range-v3 lib to drop spec version further

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "deps/optional"]
 	path = deps/optional
 	url = https://github.com/TartanLlama/optional
+[submodule "deps/range-v3"]
+	path = deps/range-v3
+	url = https://github.com/ericniebler/range-v3

deps/range-v3

@@ -0,0 +1 @@
+Subproject commit d800a032132512a54c291ce55a2a43e0460591c7

makefile

@@ -8,7 +8,7 @@ FIND ?= find
 CC = gcc
 CXX = g++
 
-INCLUDES=-Ilibstrophe -Ideps -Ideps/optional/include -Ideps/fmt/include \
+INCLUDES=-Ilibstrophe -Ideps -Ideps/optional/include -Ideps/range-v3/include -Ideps/fmt/include \
 	 $(shell xml2-config --cflags) \
 	 $(shell pkg-config --cflags gpgme) \
 	 $(shell pkg-config --cflags libsignal-protocol-c)
@@ -174,11 +174,11 @@ depend: $(SRCS) $(HDRS)
 	echo > ./.depend
 	for src in $(SRCS) ; do \
 		if [[ $$src == *.cpp ]]; then \
-			$(CXX) $(CPPFLAGS) -MM -MMD -MP -MF - \
+			g++ $(CPPFLAGS) -MM -MMD -MP -MF - \
-				-MT .$${src/.cpp/.o} $$src >> ./.depend ; \
+				-MT .$${src/.cpp/.o} $$src >> ./.depend || true ; \
 		elif [[ $$src == *.c ]]; then \
-			$(CC) $(CFLAGS) -MM -MMD -MP -MF - \
+			gcc $(CFLAGS) -MM -MMD -MP -MF - \
-				-MT .$${src/.c/.o} $$src >> ./.depend ; \
+				-MT .$${src/.c/.o} $$src >> ./.depend || true ; \
 		fi \
 	done
 	sed -i 's/\.\([a-z]*\/\)/\1./' .depend

omemo.cpp

@@ -5,8 +5,6 @@
 #include <fmt/core.h>
 #include <memory>
 #include <numeric>
-#include <optional>
-#include <ranges>
 #include <sstream>
 #include <string>
 #include <string_view>
@@ -17,6 +15,7 @@
 #include <math.h>
 #include <limits.h>
 #include <tl/optional.hpp>
+#include <range/v3/all.hpp>
 #include <strophe.h>
 #include <weechat/weechat-plugin.h>
 
@@ -1614,9 +1613,9 @@ int dls_load_devicelist(signal_int_list **devicelist, const char *jid, t_omemo *
     omemo->dbi.omemo.get(transaction, k_devicelist, v_devicelist);
 
     auto devices = v_devicelist
-        | std::ranges::views::split(';')
+        | ranges::views::split(';')
-        | std::ranges::views::transform([](auto&& str) {
+        | ranges::views::transform([](auto&& str) {
-            return std::stoul(std::string(&*str.begin(), std::ranges::distance(str)));
+            return std::stoul(std::string(&*str.begin(), ranges::distance(str)));
         });
 
     *devicelist = signal_int_list_alloc();
@@ -1718,9 +1717,9 @@ tl::optional<libsignal::pre_key_bundle> bks_load_bundle(struct signal_protocol_a
     omemo->dbi.omemo.get(transaction, k_bundle_ik, v_bundle_ik);
 
     auto r_bundle_pks = v_bundle_pk
-        | std::ranges::views::split(';')
+        | ranges::views::split(';')
-        | std::ranges::views::transform([](auto&& str) {
+        | ranges::views::transform([](auto&& str) {
-            return std::string_view(&*str.begin(), std::ranges::distance(str));
+            return std::string_view(&*str.begin(), ranges::distance(str));
         });
     auto bundle_pks = std::vector<std::string>{r_bundle_pks.begin(), r_bundle_pks.begin()};
     if (bundle_pks.size() > 0)
@@ -1739,9 +1738,9 @@ tl::optional<libsignal::pre_key_bundle> bks_load_bundle(struct signal_protocol_a
     libsignal::public_key pre_key(key_buf, key_len, omemo->context);
 
     auto r_bundle_sks = v_bundle_sk
-        | std::ranges::views::split(';')
+        | ranges::views::split(';')
-        | std::ranges::views::transform([](auto&& str) {
+        | ranges::views::transform([](auto&& str) {
-            return std::string_view(&*str.begin(), std::ranges::distance(str));
+            return std::string_view(&*str.begin(), ranges::distance(str));
         });
     auto bundle_sks = std::vector<std::string>{r_bundle_sks.begin(), r_bundle_sks.begin()};
     if (bundle_sks.size() > 0)

signal.hh

@@ -48,7 +48,7 @@ namespace libsignal {
 
         template<typename Fun, Fun &func, typename... Args,
             typename = std::enable_if_t<!std::is_same_v<int, std::invoke_result_t<Fun, pointer_type, Args...>>>>
-        inline std::invoke_result<Fun, pointer_type, Args...>::type
+        inline typename std::invoke_result<Fun, pointer_type, Args...>::type
         call(Args&&... args) {
             return func(*this, std::forward<Args>(args)...);
         }

xmpp/node.hh

@@ -108,7 +108,12 @@ namespace xml {
 }
 
 namespace stanza {
-    template<class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
+    template<class... Fs> struct overloaded : Fs... {
+        overloaded(const Fs& ...ts) : Fs{ts}... {}
+        overloaded(Fs&& ...ts) : Fs{ts}... {}
+        using Fs::operator()...;
+    };
+    template<class... Ts> overloaded(Ts&&...) -> overloaded<std::decay_t<Ts>...>;
 
     extern std::string uuid(xmpp_ctx_t *context);
 
@@ -150,7 +155,7 @@ namespace stanza {
                     [&](spec& child) {
                         xmpp_stanza_add_child(stanza, child.build(context).get());
                     },
-                    [&](std::string s) {
+                    [&](std::string& s) {
                         auto child = xmpp_stanza_new(context);
                         xmpp_stanza_set_text(child, s.data());
                         xmpp_stanza_add_child(stanza, child);