Questions tagged [std-tie]
6 questions
123
votes
3 answers
std::ignore with structured bindings?
Prelude:
std::tuple f();
std::tuple g();
C++1z will introduce syntax for structured bindings which will make it possible to write instead of
int a, b, c;
std::tie(a, b, c) = f();
something like
auto [a, b, c] =…
jotik
- 17,044
- 13
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- 123
4
votes
1 answer
Adding the : in front of variable gives wrong result
I am comparing the class. For the below code
#include
#include
#include
#include
enum class e : bool
{
positive = true,
negetive = false
};
class A
{
public:
int a;
e e1 : 1;
friend bool…
Swapnil
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4
votes
1 answer
Why structured binding fails with 'std::tie' d objects?
I was curious to do this asked
problem in the following way:
#include
#include
#include
#include
#include
#include
int main()
{
const std::set s{ 0, 1, 2, 3, 4, 5, 6, 7, 8 };
…
JeJo
- 30,635
- 6
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1
vote
1 answer
Using std::tie with bit fields seems to fail
I have the following code in C++17 in which I am defining a struct which is a bit mask and has member variables which are bit fields of type bool.
I am defining a tie function so that I can convert it to a comparable std::tuple object, which can be…
nyarlathotep108
- 5,275
- 2
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- 64
1
vote
3 answers
Are there downsides with using std::tie for golang-like error-handling while also returning a result? (C++11)
In go a common way to do error handling and still return a value is to use tuples.
I was wondering if doing the same in C++ using std::tie would be a good idea when exceptions are not applicable.
like
std::tie(errorcode, data) =…
Jimmy R.T.
- 1,314
- 1
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0
votes
0 answers
Is there something like `std::tie` for passing values from returned struct into existing variables?
I had a code like:
std::tie(info.amount, info.price) = GetAmountAndPrice();
and the GetAmountAndPrice was returning std::pair so it worked.
But there was a code review suggesting to change the return type to struct so it's clear what the returned…
Lukas Salich
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