Questions tagged [range-based-loop]
66 questions
-1
votes
1 answer
Why is range based for loop error message not still nice as of C++ 20?
In C++20, concepts were added, and so were constrained algorithms such as std::ranges::for_each.
Why is the range-based for loop error message has plain errors like:
begin and end are not declared in a scope.
Why not just:
a given expression…
Desmond Gold
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votes
1 answer
Difference between range-based for loop and normal for loop Depth-First Search implementation
I'm trying to implement a depth first search algorithm for a graph data structure and my function looks like this:
void dfs(int x, vector & Adjacency_List, v_Int& visited) {
visited[x] = 1; //Mark current vertex as visited
for (int i…
Jenson Mutton
- 91
- 6
-2
votes
1 answer
Iterating over a vector of shared_ptrs in a range-based for loop
I feel like this should have an answer already but I wasn't able to find it.
I have a vector of shared_ptrs:
vector> v;
I don't want to do anything with ownership (e.g. copying smart_ptrs) and I just want to go over the elements. Is…
NPS
- 6,003
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- 90
-2
votes
1 answer
Can't modify the value of a reference in Range based loop
I'm working on a school project of boolean minimization, and here I want to delete some elements of a set of my user defined class.
This is where the error occurs:
(dc and PI are both sets of my class Term, passed to this function by reference.…
hmlssslmn
- 11
- 2
-3
votes
2 answers
Avg of objects c++
I am trying to solve how to get the average of 2-4 objects ideally with the method beeing inside my class.
class Student {
public:
string name;
int grades;
public:
void val(string name, int grades)
{
this->name = name;
…
John
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-4
votes
1 answer
What is the difference in using and not using "&" in range-based for loops usually iterating over maps in C++?
for (auto& it: map_name) { // __ some _ code __ }
I want to know whether using & makes any big difference and can we use it to directly access second element of the iterator?
