Changes between Initial Version and Version 1 of code/howto/string

Timestamp:

Oct 9, 2008, 1:46:17 AM (17 years ago)

Author:

landauf

Comment:

—

code/howto/string

@@ +1 @@
+= HowTo: std::string =
+[[TracNav(TracNav/TOC_Development)]]
+
+== Reference ==
+For detailed information, have a look at [http://www.cplusplus.com/reference/string/string/].
+
+== Usage ==
+{{{
+#include <string>
+
+std::string myString = "test"; // Assign the string "test"
+myString += "1";               // Append "1" to "test"
+
+std::string otherString = "test2";
+
+// Combines "test1", " and " and "test"
+std::string output = myString + " and " + otherString;
+
+std::cout << output << std::endl;
+
+// Output:
+// test1 and test2
+
+
+if (myString == "test1") // This is true in our example
+{
+    std::cout << "myString is test1" << std::endl;
+}
+}}}
+
+== Characters ==
+{{{
+#include <string>
+
+std::string myString = "test";
+
+myString.size(); // Returns 4
+
+// Iterate through all characters:
+for (size_t pos = 0; pos < myString.size(); ++pos)
+{
+    std::cout << pos << ": " << myString[pos] << std::endl;
+}
+// Output:
+// 0: t
+// 1: e
+// 2: s
+// 3: t
+}}}
+Note: The position is of type '''size_t'''.
+
+== Substring ==
+{{{
+#include <string>
+
+std::string myString = "abcdefghij";
+
+// Get a substring, beginning with position 3 ('d') and length 4 ("defg"):
+std::string otherString = myString.substr(3, 4);
+
+std::cout << otherString << std::endl;
+
+// Output:
+// defg
+}}}
+
+== const std::string& ==
+Use constant references to pass strings to functions or to return linked instances:
+{{{
+class MyClass
+{
+    public:
+        void setName(const std::string& name) { this->name_ = name; }
+        const std::string& getName() const { return this->name_; }
+
+    private:
+        std::string name_;
+};
+}}}
+This avoids the creation of unnecessary copies of ''name'' and ''name_''.