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The compiler never uses an explicit constructor to perform implicit type conversions For example:
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extern void func( Number ); SmallInt si(87); int main() { // error: no implicit conversion from SmallInt to Number func( si ); // }
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The constructor can, however, be used to perform type conversions, as long as the conversions are requested explicitly by the program in the form of casts For example:
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SmallInt si(87); int main() { // error: no implicit conversion from SmallInt to Number func( si ); func( Number( si ) ); // ok: cast func( static_cast< Number >( si ) ); // ok: cast }
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A user-defined conversion is a conversion that is performed either by a conversion function or by a constructor As we have seen, the conversion performed by a conversion function can be followed by a standard conversion to bring the result of the conversion function to the target type of the conversion Similarly, the conversion performed by a constructor can be preceded by a standard conversion to bring the value to be converted to the type of the constructor parameter A user-defined conversion sequence is the combination of the user-defined conversion and the standard conversion that is needed to bring a value to the target type of a conversion A user-defined conversion sequence has the following form
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where the user-defined conversion invokes either a conversion function or a constructor When attempting to convert a value, it is possible that two different user-defined conversion sequences can be applied to convert the
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value to the target type of the conversion When more than one conversion sequence can be applied, the compiler must select the best sequence to perform the conversion In this section, we look at how this is done A class may define many conversion functions that can be used for a conversion For example, our class Number may define two conversion functions: operator int() and operator float() Both functions could be used to convert an object of type Number to a value of type float Token::operator float() could be used, of course, to obtain directly a value of type float Token::operator int() could also be used because it is possible to convert the value of type int resulting from the conversion function to a value of type float, through a standard conversion Is the conversion a biguous because there exist two user-defined conversion sequences Or is one of the user-defined conversion sequences preferred
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class Number { public: operator float(); operator int(); // }; Number num; float ff = num; // which conversion function operator float()
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If two conversion functions can be used, the standard conversion sequence following the conversion function is used to select the best user-defined conversion sequence In the previous example, the following two user-defined conversion sequences can be applied to do the conversion: 1 operator float() -> exact match 2 operator int() -> standard conversion As we saw in Section 93, an exact match is a better conversion than a standard conversion The first conversion sequence is therefore a better conversion sequence, and the conversion function Token::operator float() is chosen to do the conversion Similarly, it is possible that two constructors can be applied to convert a value to the target type of a conversion In this case the standard conversion sequence that precedes the user-defined conversion is used to select the best user-defined conversion sequence For example:
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class SmallInt { public: SmallInt( int ival ) : value( ival ) { } SmallInt( double dval ) : value( static_cast< int >( dval ) ) { } }; extern void manip( const SmallInt & ); int main() { double dobj; manip( dobj ); //ok: SmallInt( double ) }
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Here the class SmallInt defines two constructors SmallInt(int) and SmallInt(double) that can be used to convert the object dobj of type double to a value of type SmallInt The constructor SmallInt(double) can be used to do the conversion
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