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Auto comment: topic has been updated by mansigpt (previous revision, new revision, compare).
though map size is 1 still z.Second++ is unable to update it. I too don't don't get it.
auto creates copy so use this to update I think this may be the issue not completely sure though m[{(z.F.F),(z.F.S)}]++;
try passing by reference:
Right now z is just a copy of the pair in the map. In general, in the code
each x will be a copy of an element in v, and changes to x won't be reflected in v. Maybe read about references somewhere to learn more details.
In range-based loops
for (auto x : container)
mean you doing with copy ofx
and it is changable (but not the variable in the container)for (auto &x : container)
mean you doing with reference ofx
and it is changablefor (const auto x : container)
mean you doing with copy ofx
and it is unchangablefor (const auto &x : container)
mean you doing with reference ofx
and it is unchanableIf you use large container and not want to change it, you should use
for (const auto &x : container)
since it wont have to waste time on creating copies then detroys themIf you want the variable to be changable, you should use
for (auto &x : container)