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rules/S7118/cfamily/rule.adoc

@@ -80,7 +80,7 @@ Testing the equality between two full strings can be directly performed using th
 ----
 void comparisons(std::string const& s1, std::string const& s2) {
   bool equal = strcmp(s1.c_str(), s2.c_str()) == 0; // Noncompliant
-  int comparePart = strncmp(s1.c_str() + 2, s2.c_str() + 2, 10); // Noncompliant
+  int comparePart = strncmp(s1.c_str() + 2, s2.c_str() + 3, 10); // Noncompliant
 }
 ----
 
@@ -90,10 +90,17 @@ void comparisons(std::string const& s1, std::string const& s2) {
 ----
 void comparisons(std::string const& s1, std::string const& s2) {
   bool equal = s1 == s2; // Compliant
-  int comparePart = s1.compare(2, 10, s2, 2, 10); // Compliant
+  int comparePart = s1.compare(2, 10, s2, 3, 10); // Compliant
 }
 ----
 
+With C++17 and higher, substring comparison can also be done through `std::string_view`.
+
+[source,cpp]
+----
+auto comparePart = std::string_view(s1).substr(2, 10) <=> std::string_view(s2).substr(3, 10);
+----
+
 === Searching a substring
 
 Either searching a substring or a single character inside a string can be done with `std::string::find()`.
@@ -181,7 +188,20 @@ std::string beginning{string.c_str()};
 
 Direct replacement of one C function with the corresponding string method may not lead to the best code overall. When replacing a C function call, you should consider what overall functionality this call is part of and whether your {cpp} version allows to implement that functionality more easily and effectively.
 
-For example using ranges (`std::ranges::views::split`, `std::ranges::views::chunk`), using algorithms, using `std::stringstream` or `std::spanstream`, using `std::string_view`.
+For example using ranges (`std::ranges::views::split`, `std::ranges::views::chunk`), using algorithms, using `std::istringstream` or `std::ispanstream`, using `std::string_view`.
+
+An example of a function splitting words in a moddern way could be as follow.
+
+[source,cpp]
+----
+void treatWord(std::string_view word);
+
+void treatAllWords(std::string_view text) {
+  constexpr std::string_view delim{" "};
+  for (const auto word : std::views::split(text, delim))
+    treatWord(std::string_view{word});
+}
+----
 
 == Resources