replace map count/insert w/emplace in instantx.cpp #2165
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This feels like an optimization, something about:
```
if map.count(key)
return false
else
insert(pair)
return true
```
... just feels icky. Plus, `vote.GetMasternodeOutpoint()` is only called
once. The previous version might be slightly more readable, however.
src/instantx.cpp
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| return false; | ||
| mapMasternodeVotes.insert(std::make_pair(vote.GetMasternodeOutpoint(), vote)); | ||
| return true; | ||
| return mapMasternodeVotes.emplace(std::make_pair(vote.GetMasternodeOutpoint(), vote)).second; |
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what does the .second do in this instance?
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emplace is a method defined on std::map, so I will point to the documentation there (in case you're interested):
https://en.cppreference.com/w/cpp/container/map/emplace
Return value
Returns a pair consisting of an iterator to the inserted element, or the already-existing element if no insertion happened, and a bool denoting whether the insertion took place. True for Insertion, False for No Insertion.
:)
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Ahh, that makes more sense. I guess I missed the first part of the return doc when I read it a few minutes ago. Thanks
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No need for make_pair here with emplace.
src/instantx.cpp
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| return false; | ||
| mapMasternodeVotes.insert(std::make_pair(vote.GetMasternodeOutpoint(), vote)); | ||
| return true; | ||
| return mapMasternodeVotes.emplace(std::make_pair(vote.GetMasternodeOutpoint(), vote)).second; |
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No need for make_pair here with emplace.
|
You're right, good catch.
These functions just call |
|
@UdjinM6 I fully agree: nmarley@03af44a ;-) Would like to get that larger PR in after iterator cleanup if possible, so easier to merge w/o conflicts. |
* replace map count/insert w/emplace in instantx.cpp
This feels like an optimization, something about:
```
if map.count(key)
return false
else
insert(pair)
return true
```
... just feels icky. Plus, `vote.GetMasternodeOutpoint()` is only called
once. The previous version might be slightly more readable, however.
* use std::pair template constructor shortcut
This feels like an optimization, something about:
... just feels icky. Plus,
vote.GetMasternodeOutpoint()is only calledonce. The previous version might be slightly more readable, however.