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2 The floating point conversions: the conversions from any floating point type to any other floating point type (excluding the conversions that were listed as promotions earlier) 3 The floating-integral conversions: the conversions from any floating point type to any integral type or from any integral type to any floating point type 4 The pointer conversions: the conversion of the integer value zero to a pointer type and the conversion of a pointer of any type to the type void* 5 The bool conversions: the conversions from any integral type, floating point type, enumeration type, or pointer type to the type bool Here are some examples:
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extern void print( void* ); extern void print( double ); int main() { int i; print( i ); // matches print( double ); // i is converted by a standard conversion // from int to double print( &i ); // matches print( void* ); // &i is converted by a standard conversion // from int* to void* return 0; }
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The conversions that are grouped in categories 1, 2, and 3 are potentially dangerous conversions, because the target type of the conversion cannot represent all the values that the source type can represent For example, the type float cannot represent with as much precision all the values that can be represented by the type int This is why the conversions in these categories are standard conversions and not promotions
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int i; void calc( float ); int main() { calc( i ); // floating-integral standard conversion // potentially dangerous depending on i's value return 0; }
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When the function calc() is called, a floating-integral standard conversion is applied to convert the argument from type int to type float Depending on the value stored in i, it is possible that the value for i cannot be stored within a parameter of type float without a loss of precision All standard conversions are treated as requiring equal work The conversion from char to unsigned char, for example, does not take precedence over the conversion from char to double Closeness of type is not considered If two viable functions require standard conversions on the argument to match the type of their parameter, the call is ambiguous and it is flagged at compile-time as an error For example, given the following pair of overloaded functions
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extern void manip( long ); extern void manip( float );
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the following call is ambiguous:
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int main() { manip( 314 ); // error: ambiguous; // manip( float ) is not better return 0; }
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The literal constant 314 is of type double A match is achieved with either function by means of a standard conversion Because there are two standard conversions possible, the call is flagged as ambiguous No one standard conversion is given precedence over another The programmer can resolve the ambiguity either with an explicit cast, such as
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manip( static_cast<long>( 314 ) ); // manip( long )
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or through use of the float constant suffix:
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manip( 314F ); // manip( float )
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Here are more examples of function calls that are ambiguous and are flagged as errors because they match more than one function in an overloaded set:
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extern void farith( unsigned int ); extern void farith( float ); int main() { // each call is ambiguous farith( 'a' ); // argument farith( 0 ); // argument farith( 2uL ); // argument farith( 314159 ); // argument farith( true ); // argument return 0; }
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The standard pointer conversions can at times seem counterintuitive In particular, the value 0 can be converted to any pointer type: the pointer value thus created is called the null pointer value This value 0 can be any constant expression of integer type For example:
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