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  1. struct C {
  2.    constexpr C(int i) : i(i) {}
  3.    int i;
  4. };
  5.  
  6.  
  7. constexpr C plus2(const C& c) { return C{c.i + 2}; }
  8.  
  9. int main()
  10. {
  11.     const C i(0);
  12.     constexpr C j = plus2(i);
  13. }
  14.  
Compilation error #stdin compilation error #stdout 0s 3408KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function 'int main()':
prog.cpp:12:28:   in constexpr expansion of 'plus2(i)'
prog.cpp:12:28: error: the value of 'i' is not usable in a constant expression
     constexpr C j = plus2(i);
                            ^
prog.cpp:11:13: note: 'i' was not declared 'constexpr'
     const C i(0);
             ^
stdout
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Standard output is empty
https://ideone.com/bzL72l
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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