Questions tagged [stl]
Do NOT use for questions about 3D CAD model. Use [stl-format] instead. The Standard Template Library, or STL, is a C++ library of generic containers, iterators, algorithms, and function objects. Use in conjunction with [c++]. When C++ was standardised, large parts of the STL were adopted into the Standard Library, and these parts in the Standard Library are also sometimes erroneously referred to collectively as "the STL".
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How to deal with a third party DLL exporting STL symbols?
I am working on a project that is dependent on a third-party DLL. For reasons unknown, this DLL exports (most but not all) of the symbols for std::vector<unsigned char>:
$ dumpbin.exe -exports ...
- 9,127
4
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67
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What exception guarantee level does std::vector::operator=() have? [duplicate]
When I assign one std::vector to another std::vector, and std::bad_alloc raises internally, does the C++ specification guarantee that my vector will be left in the correct state? Does it have a basic ...
-3
votes
1
answer
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Getting error when trying to overload << operator in C++ [closed]
I am trying to print a vector for logging purposes in C++. I have made a function but it's throwing an error. Can anyone please help me explain why and suggest a possible fix. Here's the code snippet
#...
0
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1
answer
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Allowing STL algorithms to swap when iterators dereference to a wrapper class (i.e. an rvalue)
I am implementing a C++ wrapper for a C library that has a "vector of vectors" container. In the C++ interface, I would like iterators to dereference not to a raw C pointer, but to a ...
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C++ Rule of Zero with guaranteed/C ABI
I love and often use C++ Rule of Zero, but now there's a use case where I find it challenging to use.
I have 2 libraries, both maintained separately and even compiled with different compilers to ...
- 6,589
2
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2
answers
80
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Unclear behaviour of std::next_permutation with std::wstring
Given this program to play around with Unicode, I found results that don't make sense to me:
#include <iostream>
#include <algorithm>
#include <cassert>
int main() {
std::locale:...
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-2
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0
answers
46
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Replacing direct usage of std::_Dist_type from old msvc100 code for msvc142
I'm working on upgrading some old c++ code from msvc100 to msvc142. My problem is I am not a C++ developer, but come from C#, and I'm running into a problem with a specific type that was used directly ...
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1
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reference_wrapper in c++ containers
Consider following snippet:
#include <bits/stdc++.h>
using namespace std;
int main() {
int x=3;
int y=1;
int z=2;
cout<<(&x)<<' '<<(&y)<<' '<&...
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1
vote
1
answer
71
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Using an initializer list to init a vector
I can not figure out why it does not allow me to directly initialize a vector using the following syntax:
stl::vector<int> v{1, 2, 3};
I have implemented from scratch both the vector and the ...
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0
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57
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set c++ own comparator function find could not find an already inserted element [duplicate]
I wrote an comparator function for my set which will store an vector of 3 elememts.
Those 3 elements will be sorted always.
Now i insert the 2 elements in the set. But when i try to find the 2nd ...
0
votes
1
answer
92
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Memory error when running multiset.erase(std::prev(multiset.end()));
#include <iostream>
#include <set>
#include <iterator>
using std::cout, std::endl;
using std::multiset;
int main() {
multiset<int> m;
m.insert(1);
m.insert(2);
...
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1
answer
67
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is it mandatory to specify size of the vector when we using vector of vector? [duplicate]
vector<vector<int>>res(size);
I was working on some problem when I run the code with size its gave correct result but without size it throws seg-fault
vector<vector<int>> ...
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2
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0
answers
95
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Efficient nested parallelism
I am transitioning to parallel STL from my own thread pool. One thing in need is efficient nested parallelism. Consider the following code
std::for_each(std::execution::par_unseq, begin, end, f(i));
...
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Why does each Block in the MSVC implementation of std::deque have only 16 bytes? Can I modify it?
I learned this fact after reading Inside STL: The deque, implementation, and I am very shocked by it. 16 bytes!? That’s only twice the size of a pointer! I know that the major implementations of the ...
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2
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How to inplace initialize std::array<std::pair<const Key, Val>>?
I am trying to create a static map for where the type of the key is an enum, and the values and keys are stored inside an std::array.
The below code works nicely for trivially copiable types, but ...
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