refactor: make namespace ranges mostly an alias of std::ranges

src/util/ranges.h

@@ -5,40 +5,20 @@
 #ifndef BITCOIN_UTIL_RANGES_H
 #define BITCOIN_UTIL_RANGES_H
 
-#include <algorithm>
+#include <ranges>
 #include <optional>
 
-//#if __cplusplus > 201703L // C++20 compiler
-//namespace ranges = std::ranges;
-//#else
-
-#define MK_RANGE(FUN) \
-template <typename X, typename Z>               \
-inline auto FUN(const X& ds, const Z& fn) {     \
-    return std::FUN(cbegin(ds), cend(ds), fn);  \
-}                                               \
-template <typename X, typename Z>               \
-inline auto FUN(X& ds, const Z& fn) {           \
-    return std::FUN(begin(ds), end(ds), fn);    \
-}
-
-
 namespace ranges {
-    MK_RANGE(all_of)
-    MK_RANGE(any_of)
-    MK_RANGE(count_if)
-    MK_RANGE(find_if)
+using namespace std::ranges;
 
-    template <typename X, typename Z>
-    constexpr inline auto find_if_opt(const X& ds, const Z& fn) {
-        const auto it = ranges::find_if(ds, fn);
-        if (it != end(ds)) {
-            return std::make_optional(*it);
-        }
-        return std::optional<std::decay_t<decltype(*it)>>{};
+template <typename X, typename Z>
+constexpr inline auto find_if_opt(const X& ds, const Z& fn) {
+    const auto it = std::ranges::find_if(ds, fn);
+    if (it != std::end(ds)) {
+        return std::make_optional(*it);
     }
-
+    return std::optional<std::decay_t<decltype(*it)>>{};
+}
 }
 
-//#endif // C++20 compiler
 #endif // BITCOIN_UTIL_RANGES_H