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Exercise 814
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Explain the differences between using declarations and using directives
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Exercise 815
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Given the full example in Section 614, write the using declarations necessary to make the member of namespace std visible in this example
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Exercise 816
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Consider the following code sample:
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namespace Exercise { int ivar = 0; double dvar = 0; const int limit = 1000; } int ivar = 0; //1 void manip() { //2 double dvar = 31416; int iobj = limit + 1; ++ivar; ++::ivar; }
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What are the effects of the declarations and expressions in this code sample if using declarations for all the members of namespace Exercise are located at //1 At //2 instead Now answer the same question but replace the using declarations with a using directive for namespace Exercise
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Overloaded Functions
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Now that we know how to declare and define functions and how to use functions in our programs, this chapter looks at a special kind of functions supported in C++: overloaded functions Two functions are overloaded if they have the same name, are declared in the same scope, and have different parameter lists In this chapter, we first look at how to declare a set of overloaded functions and why it is useful to do so We then briefly look at how function overload resolution proceeds that is, how a function call is resolved to one function in a set of overloaded functions Function overload resolution is one of the most complex aspects of C++ For those of you who want to understand it in greater detail, two advanced sections are provided at the end of this chapter to describe argument type conversions and function overload resolution more fully
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Overloaded Function Declarations
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Now that we know how to declare and define functions and how to use functions in our programs, we will look at a new aspect of functions supported within C++: overloaded functions Function overloading allows multiple functions that provide a common operation on different parameter types to share a common name If you have written an arithmetic expression in a programming language, you have used a predefined overloaded function For example, the expression
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1 + 3
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invokes the addition operation for integer operands, whereas the expression
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invokes a different addition operation that handles floating point operands The operation that is actually used is transparent to the user The addition operation is overloaded to handle the different operand types It is the responsibility of the compiler, and not of the programmer, to distinguish between the different operations and to apply the appropriate operation depending on the operands' types In this chapter, we see how to define our own overloaded functions Why Overload a Function Name As is the case with the built-in addition operation, we may want to define a set of functions that perform the same general action but that apply to different parameter types For example, suppose we want to define functions that return the largest of their parameters' values Without the ability to overload a function name, we must give each function its own unique name For example, we could define a set of max() functions as follows:
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int i_max( int, int ); int vi_max( const vector<int> & ); int matrix_max( const matrix & );
Each function, however, performs the same general action; each one returns the largest of its parameters' set of values From a user's viewpoint, there is only one operation, that of determining a maximum value The implementation details of how that is accomplished are of little interest to the users of the function This lexical complexity is not intrinsic to the problem of determining the largest of a set of values but rather reflects a limitation of the programming environment in which each name occurring at the same scope must refer to a unique entity (a unique object, function, class type, and so on) Such complexity presents a practical problem to the programmer, who must remember or look up each name Function overloading relieves the programmer of this lexical complexity With function overloading, the programmer can simply write the following:
int ix = max( j, k ); vector<int> vec; // int iy = max( vec );
This technique gets the largest value in a variety of situations How to Overload a Function Name In C++, two or more functions can be given the same name provided that each parameter list is unique in either the number or the types of the parameters The following declarations are declarations for the overloaded function max():
int max( int, int ); int max( const vector<int> & ); int max( const matrix & );
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