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In general, creating a parameterized manipulator involves two items The first is a class that stores the argument passed to the manipulator The second is an inserter or extractor that is overloaded to take an object of that class as the right-hand operand When the manipulator is included in an I/O expression, an object of the class is constructed, with the argument being saved The inserter or extractor then operates on that object and is able to access the argument Let's work through this step by step, creating a simple parameterized inserter called indent, which indents output by a specified number of spaces For example, the expression
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cout << indent(10) << "Hi";
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will cause ten spaces to be output, followed by the string "Hi" As explained, all parameterized manipulators need two items The first is a class that stores the argument passed to the manipulator Therefore, to create the indent manipulator, begin by creating a class called indent that stores the argument passed to its constructor and specifies an overloaded inserter as a friend, as shown here:
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// A class that supports the indent output manipulator class indent { int len; public: indent(int i) { len = i; } friend ostream &operator<<(ostream &stream, indent ndt); };
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As you can see, the constructor takes one argument, which it stores in the private field len This is the only functionality that indent provides It simply stores the argument It does,
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however, declare operator<<( ) to be a friend This gives the operator function access to the private len field The second item you need to create is an overloaded inserter that takes an indent instance as a right-hand operand (See Create Custom Inserters and Extractors for details on creating an inserter or extractor) Have this operator output the number of spaces specified by the len field of the object on which it is operating Here is one way to implement this function:
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// Create an inserter for objects of type indent ostream &operator<<(ostream &stream, indent ndt) { for(int i=0; i < return stream; } ndtlen; ++i) stream << " ";
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As you can see, this operator takes an ostream reference as its left-hand operand and an indent object as its right-hand operand It outputs the number of spaces specified by the indent object and then returns the stream Because operator<<( ) is a friend of indent, it can access the len field, even though it is private When indent is used within an output expression, it causes an object of type indent to be created with the specified argument Then, the overloaded operator<<( ) function is invoked, passing in the stream and the newly created indent object
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Example
The following example shows both a parameterized input and a parameterized output manipulator The input manipulator is called skipchar, and on input, it skips leading characters that match the one passed to skipchar For example, skipchar('X') skips leading X's The output manipulator is indent, described in the Discussion section for this recipe
// Create simple parameterized input and output manipulators // // The indent manipulator outputs a specified number of spaces // The skipchar manipulator skips a specified character on input #include <iostream> #include <string> #include <sstream> using namespace std; // Together, the following class and overloaded operator create // the indent manipulator // A class that supports the indent output manipulator class indent { int len; public: indent(int i) { len = i; } friend ostream &operator<<(ostream &stream, indent ndt); };
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// Create an inserter for objects of type indent ostream &operator<<(ostream &stream, indent ndt) { for(int i=0; i < return stream; } // Together, the following class and overloaded operator create // the skipchar manipulator // A class that supports the skipchar input manipulator class skipchar { char ch; public: skipchar(char c) { ch = c; } friend istream &operator>>(istream &stream, skipchar sc); }; // Create an extractor for objects of type skipchar istream &operator>>(istream &stream, skipchar sc) { char ch; do { ch = streamget(); } while(!streameof() && ch == scch); if(!streameof()) streamunget(); return stream; } // Demonstrate indent and skipchar int main() { string str; // Use indent to indent output cout << indent(9) << "This is indented 9 places\n" << indent(9) << "So is this\n" << indent(18) << "But this is indented 18 places\n\n"; // Use skipchar to ignore leading zeros cout << "Enter some characters: "; cin >> skipchar('0') >> str; cout << "Leading zeros are skipped Contents of str: " << str << "\n\n"; // Use indent on an ostringstream cout << "Use indent with a string stream\n"; ostringstream ostrstrm; ostrstrm << indent(5) << 128; cout << "Contents of ostrstrm:\n" << ostrstrmstr() << endl; return 0; } ndtlen; ++i) stream << " ";
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