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Appendix B
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Library summary
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The standard library is a major contribution to the standardization of C++ Throughout this book, we have relied on the library to write succinct, idiomatic C++ programs This chapter reviews the library facilities that we used, and describes some generally useful facilities that we did not have occasion to use Each section presents a library class or family of related classes by showing and explaining how to use the relevant facilities In general, the standard library introduces names into namespace std Programs that use standard-library facilities must therefore either prefix such names by std:: or make them generally available with using-declarations In this appendix, we will not explicitly mention the need to do so Accordingly, for example, we shall refer to cout rather than to std::cout Our examples generally assume the following meanings for the names shown: n A variable or expression that yields a value of any of the integral types t A value of type T s A string value cp A pointer to the initial element of a null-terminated character array c A char value p A predicate, which is a function that returns bool or a value convertible to bool os An output stream is An input stream strm An input or output stream b An iterator that denotes the beginning of a sequence e An iterator that denotes (one past) the end of a sequence d
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An iterator that denotes a destination it An iterator that denotes an element
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B1 Input-output
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Objects of classes istream, ostream, ifstream, and ofstream denote sequential streams, with an object being bound to a single stream at any one time Objects of these types cannot be copied or assigned; therefore, the only way to pass a stream to or from a function is through a pointer or a reference Fundamentals #include <iostream> Declares input-output classes and associated operations cout cerr clog Objects of type ostream bound to the standard output (cout) and error (cerr, clog) streams Output to cout and clog is buffered by default; output to cerr is unbuffered by default cin An object of type istream bound to the standard input stream Reading and writing is >> t Conventionally, reads a value from is into t after skipping whitespace The input must be in a form suitable for conversion to the type of t, which must be a nonconst lvalue Unsuitable input causes the request to fail, leaving is in failure state until a call is made to isclear() The library defines the input operator for the built-in types and string; class authors are encouraged to follow suit os << t Conventionally, sends the value of t to os in a format appropriate to the type of t The library defines << for built-in types and string; class authors are encouraged to follow suit isget(c) Reads the next character, even if it is a whitespace character, from is into c isunget() Backs up the stream is by one character Useful when we want to read until we hit a particular character, and then want to leave that character on the stream for subsequent processing Only one character of pushback memory is guaranteed Iterators #include <iterator> Declares input and output stream iterators istream_iterator<T> in(is); Defines in as an input iterator that reads values of type T from is ostream_iterator<T> out(os, const char* sep = ""); Defines out as an output iterator that writes values of type T on the stream os, writing sep as separator value after each element By default, the separator is a null string, but it can be a string literal ( 102/176) or a pointer to a null-terminated array of characters
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File streams #include <fstream> Declares facilities for input-output to streams that are attached to files ifstream is(cp); Defines is and attaches it to the file named (in an implementation- dependent manner) by cp Class if stream is derived from istream ofstream os(cp); Defines os and attaches it to the file named by cp Class ofstream is derived from ostream Controlling output format #include <ios> Defines the streamsize type, which is a signed integral type that is appropriate to represent the sizes of input-output buffers oswidth() oswidth(n) Returns the width (as a streamsize) previously associated with os Sets the width to n if given The next item written on that stream will be padded on the left to the stream's width, after which the width will be reset to 0 osprecision() osprecision(n) Returns the precision (as a streamsize) previously associated with os Sets the precision to n if given Subsequent floating-point values written on that stream will appear with the given number of significant digits
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Manipulators #include <iomanip> Declares manipulators other than endl, which is declared in <iostream> os << endl Ends the current output line and flushes the stream associated with os os << flush Flushes the stream associated with os os << setprecision(n) os << setw(n) Equivalent to osprecision(n) and oswidth(n) respectively Errors and end-of-file strmbad() Returns a bool indicating whether the last operation on strm failed as a result of invalid data strmclear() Attempts to reset strm so that it can be used after an invalid operation Throws ios::failure if strm cannot be reset strmeof() Returns a bool indicating whether strm has hit end-of-file
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