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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4. //---------------------------------------------------------
  5.  
  6. class Logger {
  7.   public:
  8.     void write(int x);
  9.     void write(double x);
  10.  
  11.     template <typename T>
  12.     void writeLine(T x);
  13. };
  14.  
  15. void Logger::write(int x) {
  16.     std::cout << x;
  17. }
  18.  
  19. void Logger::write(double x) {
  20.     std::cout << std::setprecision(3) << x;
  21. }
  22.  
  23. template <typename T>
  24. void Logger::writeLine(T x) {
  25.     write(x);
  26.     std::cout << std::endl;
  27. }
  28.  
  29. //---------------------------------------------------------
  30.  
  31. class FooType1 {};
  32. class FooType2 {};
  33.  
  34. class FooLogger : public Logger {
  35.   public:
  36.     using Logger::write;
  37.  
  38.     void write(FooType1 x);
  39.     void write(FooType2 x);
  40. };
  41.  
  42.  
  43. void FooLogger::write(FooType1 x) {
  44.     std::cout << "<value of type FooType1>";
  45. }
  46. void FooLogger::write(FooType2 x) {
  47.     std::cout << "<value of type FooType2>";
  48. }
  49.  
  50. //---------------------------------------------------------
  51.  
  52. int main(int argc, char **argv) {
  53.     FooLogger log;
  54.     FooType1 foo1;
  55.     FooType2 foo2;
  56.  
  57.     log.write(42);           // OK
  58.     log.write(3.14159);      // OK
  59.     log.write(foo1);         // OK
  60.     log.write(foo2);         // OK
  61.  
  62.     std::cout << std::endl;
  63.  
  64.     log.writeLine(42);       // OK
  65.     log.writeLine(3.14159);  // OK
  66.     // log.writeLine(foo1);     // error: no matching member function for call to 'write'
  67.     // log.writeLine(foo2);     // error: no matching member function for call to 'write'
  68. }
  69.  
Success #stdin #stdout 0s 15232KB
comments (?)
stdin
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Standard input is empty
stdout
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423.14<value of type FooType1><value of type FooType2>
42
3.14
https://ideone.com/pmj0fb
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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