When trying to compile test.cpp: ' namespace { struct A { A() {} explicit A(short i) :m_value(i) {}
A& operator = (short i) { m_value = i; return *this; } operator short& () { return m_value; } operator short () const { return m_value; } private: short m_value; }; const A CONSTA(-1); struct M { void set(A& value) const { value = 1 ? m_a : CONSTA; } short m_a; }; } int main(int argc, char** argv) { return 0; } ' test.cpp: In member function 'void<unnamed>::M::set(<unnamed>::A&) const': test.cpp:28: error: passing 'const<unnamed>::A' as 'this' argument of '<unnamed>::A::operator short int&()' discards qualifiers expected: convert const A to short and proceed. Build/Plattform/Version/Config info, as requested: Using built-in specs. Target: sparc-sun-solaris2.9 Configured with: ../gcc-4.1.1/configure --prefix=/opt/gnu//gcc-4.1.1 --enable-languages=c,c++ --with-ld=/opt/gnu//bin/ld --with-as=/opt/gnu//bin/as Thread model: posix gcc version 4.1.1 /opt/gnu/gcc-4.1.1/bin/../libexec/gcc/sparc-sun-solaris2.9/4.1.1/cc1plus -E -quiet -v -iprefix /opt/gnu/gcc-4.1.1/bin/../lib/gcc/sparc-sun-solaris2.9/4.1.1/ test.cpp -mcpu=v7 -fpch-preprocess -o test.ii ignoring nonexistent directory "/opt/gnu/gcc-4.1.1/bin/../lib/gcc/sparc-sun-solaris2.9/4.1.1/../../../../sparc-sun-solaris2.9/include" ignoring duplicate directory "/opt/gnu//gcc-4.1.1/lib/gcc/sparc-sun-solaris2.9/4.1.1/../../../../include/c++/4.1.1" ignoring duplicate directory "/opt/gnu//gcc-4.1.1/lib/gcc/sparc-sun-solaris2.9/4.1.1/../../../../include/c++/4.1.1/sparc-sun-solaris2.9" ignoring duplicate directory "/opt/gnu//gcc-4.1.1/lib/gcc/sparc-sun-solaris2.9/4.1.1/../../../../include/c++/4.1.1/backward" ignoring duplicate directory "/opt/gnu//gcc-4.1.1/lib/gcc/sparc-sun-solaris2.9/4.1.1/include" ignoring nonexistent directory "/opt/gnu//gcc-4.1.1/lib/gcc/sparc-sun-solaris2.9/4.1.1/../../../../sparc-sun-solaris2.9/include" #include "..." search starts here: #include <...> search starts here: /opt/gnu/gcc-4.1.1/bin/../lib/gcc/sparc-sun-solaris2.9/4.1.1/../../../../include/c++/4.1.1 /opt/gnu/gcc-4.1.1/bin/../lib/gcc/sparc-sun-solaris2.9/4.1.1/../../../../include/c++/4.1.1/sparc-sun-solaris2.9 /opt/gnu/gcc-4.1.1/bin/../lib/gcc/sparc-sun-solaris2.9/4.1.1/../../../../include/c++/4.1.1/backward /opt/gnu/gcc-4.1.1/bin/../lib/gcc/sparc-sun-solaris2.9/4.1.1/include /usr/local/include /opt/gnu//gcc-4.1.1/include /usr/include End of search list. /opt/gnu/gcc-4.1.1/bin/../libexec/gcc/sparc-sun-solaris2.9/4.1.1/cc1plus -fpreprocessed test.ii -quiet -dumpbase test.cpp -mcpu=v7 -auxbase test -version -o test.s GNU C++ version 4.1.1 (sparc-sun-solaris2.9) compiled by GNU C version 4.1.1. GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: 3f2c8f59f6f5b35c02abcffa8ee26357 test.cpp: In member function 'void<unnamed>::M::set(<unnamed>::F&) const': test.cpp:28: error: passing 'const<unnamed>::A' as 'this' argument of '<unnamed>::A::operator short int&()' discards qualifiers -- Summary: c++ frontend error: ?-operator parameter binding Product: gcc Version: 4.1.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: istvan at benedek-home dot de GCC build triplet: sparc-sun-solaris2.9 GCC host triplet: sparc-sun-solaris2.9 GCC target triplet: sparc-sun-solaris2.9 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30925