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  1. #include <iostream>
  2.  
  3. template <std::size_t N> struct Debug; // No definition
  4.  
  5. struct obj
  6. {
  7. 	int oldField;	
  8. 	int newField;	
  9. };
  10.  
  11.  
  12. template <> struct Debug<4> {}; // Definition for "old" sizeof;
  13.  
  14. template struct Debug<sizeof(obj)>; // instanciate Debug, issue error if definition is missing
  15.  
  16. int main() {
  17. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:14:17: error: explicit instantiation of ‘struct Debug<8ul>’ before definition of template
 template struct Debug<sizeof(obj)>; // instanciate Debug, issue error if definition is missing
                 ^~~~~~~~~~~~~~~~~~
stdout
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Standard output is empty
https://ideone.com/CJFo4b
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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