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vector<int> f(); extern vector<int> vec; int main() { manip( vec ); // manip( vector<int> & ) is selected manip( f() ); // manip( const vector<int> & ) is selected return 0; }
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In the first call, the reference initialization to call either function is an exact match But this call is not ambiguous Because both reference initializations are identical except that the second one adds an additional const qualification, the initialization without the additional qualification is considered a better initialization Hence the viable function manip (vector<int>&) is the best viable function for the first call In the second call, there is only one viable function for the call: manip(const vector<int>&) Because the argument is a temporary that holds the return value of the function call f(), the argument is an rvalue that cannot be used to initialize the nonconst reference parameter of manip(vector<int>&) The best viable function for the second call is therefore the only viable function considered: manip(const vector<int>&) Of course, function calls can have more than one argument The selection of the best viable function must take into account the ranking of the conversion sequences needed to convert all of the arguments Let's examine an example:
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extern int ff( char*, int ); extern int ff( int, int ); int main() { ff( 0, 'a' ); // ff( int, int ) return 0; }
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The function ff() taking two arguments of type int is selected as the best viable function because of the following reasons 1 Its first argument is better 0 is an exact match for a parameter of type int, whereas it requires a pointer standard conversion sequence to match a parameter of type char* 2 Its second argument is equally good The argument 'a' is of type char and requires a conversion sequence that has promotion rank to match the second parameter of both functions Here is another example:
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int compute( const int&, short ); int compute( int&, double ); extern int iobj; int main() { compute( iobj, 'c' ); // compute( int&, double ) return 0; }
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The two functions compute(const int&, short) and compute(int &, double) are viable functions The second
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function is selected as the best viable function because of the following reasons 1 Its first argument is better The reference initialization for the first viable function is worse, because it adds a const qualification and the initialization for the second viable function does not 2 Its second parameter is as good The argument 'c' is of type char and requires a conversion sequence of standard conversion rank to match the second parameter of both functions Default Arguments Default arguments can allow more functions into the set of viable functions A viable function is a function that can be called with the argument list specified in the call A viable function can have more parameters than there are arguments in the argument list in the function call if each additional parameter has an associated default argument:
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extern void ff( int ); extern void ff( long, int = 0 ); int main() { ff( 2L ); // matches ff( long, 0 ); ff( 0, 0 ); // matches ff( long, int ); ff( 0 ); // matches ff( int ); ff( 314 ); // error: ambiguous }
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For the first and third calls, even though the argument list only has one argument, the second function ff() is a viable function for both calls for the following reasons 1 A default argument is provided for the function's second parameter 2 Its first parameter is of type long, which matches the type of the argument of the first call exactly and the type of the argument of the third call with a conversion sequence that has standard conversion rank The last call is ambiguous, because both instances can match through the application of a standard conversion on the first argument There is no preference given to ff(int), because it has exactly one argument
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