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Re: c++/880: Return type of type operator is not equivalent to return type of member function.
- From: bangerth at dealii dot org
- To: gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, johan at tiq dot com, nobody at gcc dot gnu dot org
- Date: 10 Nov 2002 20:26:27 -0000
- Subject: Re: c++/880: Return type of type operator is not equivalent to return type of member function.
- Reply-to: bangerth at dealii dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, johan at tiq dot com, nobody at gcc dot gnu dot org, gcc-gnats at gcc dot gnu dot org
Synopsis: Return type of type operator is not equivalent to return type of member function.
State-Changed-From-To: analyzed->closed
State-Changed-By: bangerth
State-Changed-When: Sun Nov 10 12:26:25 2002
State-Changed-Why:
The array assignment extension seems to have gone, and the
code now produces consistent messages. With this code:
-----------------------------------
typedef float vec2_t[2];
class vec2 {
private:
vec2_t v;
public:
operator vec2_t & () { return v; }
vec2_t & asvec2_t () { return v;}
};
vec2_t & func (vec2_t & v) {
return v;
}
int main (int argc, char **argv) {
vec2_t U, V;
vec2 v;
U = V; // array-to-array copy
float f = v[0]; // implicit call to vec2::operator vec2_t & ()
U = v.asvec2_t(); // explicit conversion
U = func (v); // implicit call to vec2::operator vec2_t & ()
U = v; // Error: "incompatible types in assignment of
// `vec2' to `float[2]'". Now this is inconsistent
// behaviour and seems to me as a bug.
}
------------------------------------
I now get:
-------------------------------
tmp/g> /home/bangerth/bin/gcc-3.3x-pre/bin/c++ -c cpptest.cpp
cpptest.cpp: In function `int main(int, char**)':
cpptest.cpp:20: error: ISO C++ forbids assignment of arrays
cpptest.cpp:22: error: ISO C++ forbids assignment of arrays
cpptest.cpp:23: error: ISO C++ forbids assignment of arrays
cpptest.cpp:24: error: incompatible types in assignment of `vec2' to `float[2]'
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=880