C++20 corrections

config/cpp20.mk

@@ -0,0 +1,3 @@
+include $(config_dir)rel.mk
+
+this_cxxflags += -std=c++20

src/utki/sort.hpp

@@ -33,6 +33,7 @@ SOFTWARE.
 
 #pragma once
 
+#include <algorithm>
 #include <iterator>
 
 #include "config.hpp"

src/utki/string.cpp

@@ -34,6 +34,7 @@ SOFTWARE.
 
 #include <fast_float/fast_float.h>
 
+#include "config.hpp"
 #include "debug.hpp"
 #include "util.hpp"
 
@@ -357,7 +358,11 @@ void string_parser::skip_inclusive_until(char c)
 char string_parser::skip_inclusive_until_one_of(utki::span<const char> c)
 {
 	for (; !this->view.empty(); this->view = this->view.substr(1)) {
+#if CFG_CPP >= 20
+		auto i = std::ranges::find(c, this->view.front());
+#else
 		auto i = std::find(c.begin(), c.end(), this->view.front());
+#endif
 		if (i != c.end()) {
 			this->view = this->view.substr(1);
 			return *i;

tests/unit/src/math.cpp

@@ -1,5 +1,6 @@
 #include <tst/check.hpp>
 #include <tst/set.hpp>
+#include <utki/config.hpp>
 #include <utki/math.hpp>
 
 namespace {
@@ -23,7 +24,13 @@ const tst::set set("math", [](tst::suite& suite) {
 		tst::check_lt(std::abs(std::exp((long double)(utki::log_2)) - 2), (long double)(epsilon), SL);
 
 		tst::check_eq(std::log((long double)(1)), (long double)(0), SL);
-		tst::check_lt(std::abs(std::log((long double)(2)) - (long double)(utki::log_2)), (long double)(epsilon), SL);
+		tst::check_lt(std::abs(
+#if CFG_CPP >= 20
+			std::numbers::ln2_v<long double>
+#else
+			std::log((long double)(2))
+#endif
+			 - (long double)(utki::log_2)), (long double)(epsilon), SL);
 
 		tst::check_eq(utki::rad_to_deg(float(utki::pi)), float(two_pi_degrees), SL);
 		tst::check_eq(utki::deg_to_rad(float(two_pi_degrees)), float(utki::pi), SL);