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I have the following code
vector::vector(const vector& arg)
:sz{arg.sz}, elem{new double[arg.sz]}
{
copy(arg, arg+sz, elem);
}
How is arg converted into an iterator here? whats the mechanism called that defines the conversion internally of vector outputting the needed iterator?
Thanks
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vector<char> vec;
vec.push_back(0x1);
char* a = "qwe";
I want to push a to the end of the vector.
You can use the .insert() member function with pointers standing in as iterators.
vec.insert(vec.end(), a, a+strlen(a));
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I just have a general question. Can you have a string and an integer in one vector? I am planning to display card names and numbers. I want to display both and wanting the numbers to be added up at the end. Can I do this?
You can have std::string and int in one std::vectorusing std::variant
using ElementType = std::variant<std::string, int>;
std::vector<ElementType> v;
v.push_back(std::string("I am string"));
v.push_back(1);
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Lets say I have
void swap(int &x, int &y){
//do swap here
}
Why is it legal to do: x = y inside of the function so that it assigns the VALUE of y to x?
Why isn't some sort of dereferencing needed?
There's no dereferencing needed since references are not pointers. They are aliases to the referenced object.
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I have a matrix in one class. That matrix is allocated dinamically, I want to encapsulate it.
Here is my matrix declaration in the Header file:
float** matrix;
And here is the declaration of get method:
float *getMatrix();
Is everything correct so far?
I don't know how to work with pointers in that case. How would the get function look like?
if you want just to return matrix you should use
float** getMatrix();
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Currently, I have code like:
static YAML::Node *doc;
...
__attribute__((constructor)) void inityaml() {
doc = new YAML::Node;
parser.GetNextDocument(*doc);
}
The question is, is there any more C++-conventions-ish way to perform this task, like the use of a global reference or something?
Why not avoid heap allocation altogether?
i.e.
static YAML::Node doc;
...
void inityaml() {
parser.GetNextDocument(&doc);
}