Changes Meaning Of

ChangesMeaningOf is an error message from GnuCpp which arose when changes after version 4.1.2 broke code which had previously worked. This is best illustrated with an example. I came across this while working with BoostFusion. -- JohnFletcher

Example code

namespace Z {
  template <typename T> struct A { },;
},

using Z::A;

template <typename U> struct B
{
#ifdef FAILS
 typedef A<U> A;  
 // Fails to compile with gcc 4.3.0 20070323
 //generic_test.cpp:13: error: declaration of 'typedef struct Z::A<U> B<U>::A'
 //generic_test.cpp:4: error: changes meaning of 'A' from 'struct Z::A<U>'
 // Does not fail with gcc 4.1.2
#else
 typedef Z::A<U> A;
#endif
},;

The solution to the problem is to use the qualified name Z::A<U> in the typedef.

CategoryCpp CategoryCppTemplates