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  1. #include <stdio.h>
  2.  
  3. class Double
  4. {
  5. public:
  6. };
  7. class Float
  8. {
  9. public:
  10.   operator Double(){ printf( "Float to Double\n" ); return Double(); }
  11. };
  12.  
  13. Double operator +( Double left, Double right ){ printf( "::operator+(Double,Double)\n" ); return Double(); }
  14.  
  15.  
  16. int main( void )
  17. {
  18.     Double  d;
  19.     Float   f;
  20.  
  21.     printf( "[0]\n" ); 
  22.     f + f;
  23.  
  24.     printf( "[1]\n" ); 
  25.     d + d;
  26.  
  27.     printf( "[2]\n" );
  28.     d + f; // fはDoubleへ暗黙の型変換が発生する。
  29.  
  30.     printf( "[3]\n" );
  31.     f + d; // fはDoubleへ暗黙の型変換が発生する。
  32.  
  33.     return 0;
  34. }
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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[0]
Float to Double
Float to Double
::operator+(Double,Double)
[1]
::operator+(Double,Double)
[2]
Float to Double
::operator+(Double,Double)
[3]
Float to Double
::operator+(Double,Double)
https://ideone.com/1x6RcP
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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