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[Bug c++/19068] gdb cannot handle operator= if both const access (as rhs) and non-const (lhs) methods defined
- From: "richard_sharman at mitel dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Mon, 05 Oct 2015 18:13:01 +0000
- Subject: [Bug c++/19068] gdb cannot handle operator= if both const access (as rhs) and non-const (lhs) methods defined
- Auto-submitted: auto-generated
- References: <bug-19068-4717 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=19068
--- Comment #2 from Richard Sharman <richard_sharman at mitel dot com> ---
If a class is defined with a single operator[] method,
then gdb can invoke this method with the normal x[i] syntax.
If, however, there are separate const "rhs" and non-const "lhs"
methods defined, then trying to print or assign using x[i] syntax
produces the message "Could not find operator[].".
See example t.c. When compiled as is (SEPARATE_SUB_METHODS defined)
there are methods
const T& operator[](const int index) const
and
T& operator[](const int index) {
Running gdb shows:
(gdb) b 53
Breakpoint 1 at 0x40076a: file t.cc, line 53.
(gdb) r
(gdb) p x
$1 = {storage = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100}}
(gdb) p x[3]
Could not find operator[].
(gdb) show version
GNU gdb (GDB) 7.10
Copyright (C) 2015 Free Software Foundation, Inc.
When SEPARATE_SUB_METHODS is undefined there is only one method
T& operator[](const int index) {
and gdb works fine with this:
(gdb) b 53
Breakpoint 1 at 0x40076a: file t2.cc, line 53.
(gdb) r
Starting program: /localhome/sharman/tmp/c++test/t2
Breakpoint 1, main (NameError: Installation error: gdb.execute_unwinders
function is missing
argc=1, argv=0x7fffffffdbc8) at t2.cc:53
53 printf("%2d: %d\n", i, x[i]);
(gdb) p x
$1 = {storage = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100}}
(gdb) p x[3]
NameError: Installation error: gdb.execute_unwinders function is missing
$2 = (int &) @0x7fffffffdab8: 30
(gdb) set var x[3] = 33
(gdb) p x[3]
$3 = (int &) @0x7fffffffdab8: 33
(gdb) p x
$4 = {storage = {10, 20, 33, 40, 50, 60, 70, 80, 90, 100}}
(gdb)
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