* Why does the prettyprint of std::tuple start with [1]?
@ 2021-06-13 13:49 Paul Smith
2021-06-13 15:35 ` Paul Smith
0 siblings, 1 reply; 3+ messages in thread
From: Paul Smith @ 2021-06-13 13:49 UTC (permalink / raw)
To: gdb
Am I the only one to be confused by the fact that the pretty-printer
for std::tuple values starts indexing at 1 instead of 0?
(gdb) p info
$1 = (const std::tuple<TestType, DataType> &) @0x7fffffffd550: {
param = std::tuple containing = {
[1] = TestType::OneTest,
[2] = DataType::SomeData
},
index = 2
}
Why aren't the indexes on the left numbered [0] and [1], corresponding
to the values used with std::get(), instead of [1] and [2]?
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: Why does the prettyprint of std::tuple start with [1]?
2021-06-13 13:49 Why does the prettyprint of std::tuple start with [1]? Paul Smith
@ 2021-06-13 15:35 ` Paul Smith
2021-06-13 15:43 ` David Blaikie
0 siblings, 1 reply; 3+ messages in thread
From: Paul Smith @ 2021-06-13 15:35 UTC (permalink / raw)
To: gdb
On Sun, 2021-06-13 at 09:49 -0400, Paul Smith wrote:
> Am I the only one to be confused by the fact that the pretty-printer
> for std::tuple values starts indexing at 1 instead of 0?
>
> (gdb) p info
> $1 = (const std::tuple<TestType, DataType> &) @0x7fffffffd550: {
> param = std::tuple containing = {
> [1] = TestType::OneTest,
> [2] = DataType::SomeData
> },
> index = 2
> }
>
> Why aren't the indexes on the left numbered [0] and [1],
> corresponding
> to the values used with std::get(), instead of [1] and [2]?
Hm, maybe this belongs on the GCC mailing list instead of here.
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: Why does the prettyprint of std::tuple start with [1]?
2021-06-13 15:35 ` Paul Smith
@ 2021-06-13 15:43 ` David Blaikie
0 siblings, 0 replies; 3+ messages in thread
From: David Blaikie @ 2021-06-13 15:43 UTC (permalink / raw)
To: paul; +Cc: gdb
Likely it does, yeah.
Probably a bug in libstdc++'s pretty printer:
https://github.com/gcc-mirror/gcc/blob/8a7d54b1e10b8f4fba1358260ed2e7056ed23cbd/libstdc%2B%2B-v3/python/libstdcxx/v6/printers.py#L528
https://github.com/gcc-mirror/gcc/blob/8a7d54b1e10b8f4fba1358260ed2e7056ed23cbd/libstdc%2B%2B-v3/python/libstdcxx/v6/printers.py#L563
Something related to those bits of code.
On Sun, Jun 13, 2021 at 8:37 AM Paul Smith <paul@mad-scientist.net> wrote:
> On Sun, 2021-06-13 at 09:49 -0400, Paul Smith wrote:
> > Am I the only one to be confused by the fact that the pretty-printer
> > for std::tuple values starts indexing at 1 instead of 0?
> >
> > (gdb) p info
> > $1 = (const std::tuple<TestType, DataType> &) @0x7fffffffd550: {
> > param = std::tuple containing = {
> > [1] = TestType::OneTest,
> > [2] = DataType::SomeData
> > },
> > index = 2
> > }
> >
> > Why aren't the indexes on the left numbered [0] and [1],
> > corresponding
> > to the values used with std::get(), instead of [1] and [2]?
>
> Hm, maybe this belongs on the GCC mailing list instead of here.
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-06-13 13:49 Why does the prettyprint of std::tuple start with [1]? Paul Smith
2021-06-13 15:35 ` Paul Smith
2021-06-13 15:43 ` David Blaikie
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