Mention suppression in stylecheck error + document in style guide

docs/en/development/style.md

@@ -694,6 +694,51 @@ auto s = std::string{"Hello"};
 
 **2.** Exception specifiers from C++03 are not used.
 
+**3.** Constructs which have convenient syntactic sugar in modern C++, e.g.
+
+```
+// "Traditional" C++
+
+template <typename G, typename = std::enable_if_t<std::is_same<G, F>::value, void>> // SFINAE via std::enable_if, usage of ::value
+std::pair<int, int> func(const E<G> & e) // explicitly specified return type
+{
+    if (elements.count(e)) // .count() membership test
+    {
+        // ...
+    }
+
+    elements.erase(
+        std::remove_if(
+            elements.begin(), elements.end(),
+            [&](const auto x){
+                return x == 1;
+            }),
+        elements.end()); // remove-erase idiom
+
+    return std::make_pair(1, 2); // create pair via make_pair()
+}
+
+// C++14/17/20
+
+template <typename G>
+requires std::same_v<G, F> // SFINAE via C++20 concept, usage of C++14 template alias
+auto func(const E<G> & e) // auto return type (C++14)
+{
+    if (elements.contains(e)) // C++20 .contains membership test
+    {
+        // ...
+    }
+
+    elements.erase_if(
+        elements,
+        [&](const auto x){
+            return x == 1;
+        }); // C++20 std::erase_if
+
+    return {1, 2}; // or: return std::pair(1, 2); // create pair via initialization list or value initialization (C++17)
+}
+```
+
 ## Platform {#platform}
 
 **1.** We write code for a specific platform.

utils/check-style/check-style

@@ -228,8 +228,9 @@ find $ROOT_PATH -name '.gitmodules' | while read i; do grep -F 'url = ' $i | gre
 # There shouldn't be any code snippets under GPL or LGPL
 find $ROOT_PATH/{src,base,programs} -name '*.h' -or -name '*.cpp' 2>/dev/null | xargs grep -i -F 'General Public License' && echo "There shouldn't be any code snippets under GPL or LGPL"
 
-# std::make_tuple/pair was superseded by std::pair/tuple, use "// NOLINT(style-check-make-pair-tuple)" to suppress the check
-find $ROOT_PATH/{src,base,programs} -name '*.h' -or -name '*.cpp' 2>/dev/null | xargs grep -P 'std::make_(pair|tuple).*(?<!NOLINT\(style-check-make-pair-tuple\))$' && echo "std::make_pair/make_tuple should be replaced by std::pair/tuple"
+# std::make_tuple/pair was superseded by std::pair/tuple
+find $ROOT_PATH/{src,base,programs} -name '*.h' -or -name '*.cpp' 2>/dev/null | xargs grep -P
+'std::make_(pair|tuple).*(?<!NOLINT\(style-check-make-pair-tuple\))$' && echo "std::make_pair/make_tuple should be replaced by std::pair/tuple, use // NOLINT(style-check-make-pair-tuple) to suppress the check"
 
 # There shouldn't be any docker containers outside docker directory
 find $ROOT_PATH -not -path $ROOT_PATH'/tests/ci*' -not -path $ROOT_PATH'/docker*' -not -path $ROOT_PATH'/contrib*' -name Dockerfile -type f 2>/dev/null | xargs --no-run-if-empty -n1 echo "Please move Dockerfile to docker directory:"