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What happens during the last (third) step of the function overload resolution process
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During the second step of function overload resolution, the compiler identifies and ranks the conversions that can apply to each argument in a function call to convert it to the type of the corresponding parameter in each viable function There are three possible outcomes of this ranking: 1 An exact match The argument matches the type of the function parameter exactly For example, given the following three print() functions in the set of overloaded functions, each of the following three calls to print() results in an exact match:
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void print( unsigned int ); void print( const char* ); void print( char ); unsigned int a; print( 'a' ); // matches print( char ); print( "a" ); // matches print( const char* ); print( a ); // matches print( unsigned int );
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2 Match with a type conversion The argument does not directly match the type of the parameter, but it can be converted to such a type:
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void ff( char ); ff( 0 ); // argument converted from int to char
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3 No match The argument cannot be made to match a parameter of the declared functions, because no type conversions exist between the argument and the corresponding function parameter Each of the arguments in the following two calls to print() results in a no match:
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// print() declarations as above int *ip; class SmallInt { /* */ }; SmallInt si; print( ip ); // error: no match print( si ); // error: no match
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For the argument to be an exact match, the argument need not exactly match the type of the parameter There are some minor conversions that can be applied to the argument The possible conversions in the exact match category are the following conversions: 1 Lvalue-to-rvalue conversion 2 Array-to-pointer conversion 3 Function-to-pointer conversion
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4 Qualification conversions We will examine these conversions in more detail later The category of a match with a type conversion is the most complex of the three categories Several kinds of type conversions must be considered The possible conversions can be grouped into three categories: promotions, standard conversions, and user-defined conversions The promotions and standard conversions are examined later in this chapter User-defined conversions will be presented later, after classes have been discussed in detail A user-defined conversion is performed by a conversion function, a member function that allows a class to define its own set of "standard" conversions 15 looks at conversion functions for classes and at function overload resolution involving user-defined conversions When selecting the best viable function for a function call, the compiler selects the function for which the type conversions on the arguments are the "best" Type conversions are ranked as follows: an exact match is better than a promotion, a promotion is better than a standard conversion, and a standard conversion is better than a user-defined conversion We will examine the ranking of type conversions further in Section 94, but, as we describe the possible type conversions here, some of the examples in this section will show simple cases of how this ranking is used to select the best viable function Details of an Exact Match The simplest case of exact match is when the arguments match the type of the function parameters exactly For example, given the following two max() functions in the overload set, each of the following two calls to max() has arguments that exactly match the parameters of a particular function in the overload set:
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int max( int, int ); double max( double, double ); int i1; void calc( double d1 ) { max( 56, i1 ); // exactly matches max( int, int ); max( d1, 669 ); // exactly matches max( double, double ); }
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An enumeration type defines a unique type that matches exactly only the enumerators within the enumeration and the objects declared to be of the enumeration type For example:
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enum Tokens { INLINE = 128; VIRTUAL = Tokens curTok = INLINE; enum Stat { Fail, Pass }; extern void ff( Tokens ); extern void ff( Stat ); extern void ff( int ); int main() { ff( Pass ); // exactly matches ff( 0 ); // exactly matches ff( curTok ); // exactly matches // }
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129; };
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ff( Stat ) ff( int ) ff( Tokens )
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As we mentioned earlier, an argument can be an exact match even though some minor type conversions must be applied to the
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