initializer-list Questions
1
Solved
In the following code, struct A has two constructors: A(int) and A(std::initializer_list<char>). Then an object of the struct is created with A({0}):
#include <initializer_list>
struct...
Multipartite asked 3/2, 2022 at 7:25
2
Solved
I have some pretty complicated objects. They contain member variables of other objects. I understand the beauty of copy constructors cascading such that the default copy constructor can often work....
Yazzie asked 30/1, 2022 at 1:53
4
Imagine you have a simple matrix class
template <typename T = double>
class Matrix {
T* data;
size_t row, col;
public:
Matrix(size_t m, size_t n) : row(m), col(n), data(new T[m*n]) {}
...
Fazeli asked 4/4, 2013 at 11:44
4
I tried to compile the following snippets with gcc4.7
vector<pair<int,char> > vp = {{1,'a'},{2,'b'}};
//For pair vector, it works like a charm.
vector<tuple<int,double,char> ...
Siler asked 15/9, 2012 at 10:28
2
Solved
#include <vector>
int main()
{
auto v = std::vector{std::vector<int>{}};
return v.front().empty(); // error
}
See online demo
However, according to Scott Meyers' Effective Modern C+...
Aida asked 30/8, 2021 at 7:18
3
Solved
I have a bunch of test vectors, presented in the form of hexadecimal strings:
MSG: 6BC1BEE22E409F96E93D7E117393172A
MAC: 070A16B46B4D4144F79BDD9DD04A287C
MSG: 6BC1BEE22E409F96E93D7E117393172AAE2D8...
Harless asked 24/12, 2018 at 12:59
2
Solved
For some reasons I have to implement a multidimensional array class in C++.
The array in question is something like this:
template <typename T, typename = std::enable_if_t<std::is_arithmetic...
Unavailing asked 20/11, 2018 at 5:28
1
Solved
In the following C++20 program I put by mistake one extra pair of curved braces {} in B{{{{A{}}}}}:
#include <iostream>
struct A
{
A() { std::cout << "A() "; }
A( A&&am...
Covington asked 18/7, 2021 at 9:32
2
Solved
Please consider this simplified c++14 program:
#include <iostream>
struct A
{
A() { std::cout << "A() "; }
~A() { std::cout << "~A() "; }
};
int main()
{
...
Patience asked 16/7, 2021 at 11:15
1
Solved
I compile this code below with GCC 11.1.0 with a flag -std=c++17. It occurs that on the stdout is printed initializer_list.
I compiled the same code with MSVC with the flag -std=c++17 but it printe...
Startle asked 10/7, 2021 at 14:51
4
Solved
Why are the first two calls to doSomething OK by the compiler, but using two elements in the list causes an ambiguous call?
#include <vector>
#include <string>
void doSomething(const ...
Accusative asked 6/1, 2017 at 14:15
4
Solved
Why does gcc throw a hissy fit if the initializer list order doesn't match variable order in the class?
class myClass
{
public:
int A;
int B;
myClass();
};
myClass::myClass() :
B(1),
A(2)
{}
...
Rebeckarebeka asked 18/6, 2014 at 12:4
1
Solved
I have a question about C++ initializer list disambiguation which exhibits different behaviors between gcc, clang and Visual Studio.
I wonder if this is "undefined behavior" (incorrect pr...
Gonium asked 25/2, 2021 at 16:24
5
Solved
I am trying to iterate over a number of std::lists, sorting each of them. This is the naive approach:
#include<list>
using namespace std;
int main(void){
list<int> a,b,c;
for(auto&am...
Renaterenato asked 30/7, 2015 at 13:14
3
Solved
I have been looking at how the initializer_list is implemented so I found section 18.9 of the standard and found a simple enough looking interface. I thought it would be instructive to make my own ...
Margit asked 10/8, 2013 at 17:7
2
Solved
Consider the following minimal example:
#include <iostream>
struct X {
X() { std::cout << "Default-ctor" << std::endl; }
X(std::initializer_list<int> l) {
std...
Socle asked 15/12, 2020 at 1:31
4
Solved
In C++11, is it possible to do something similar to the following?
template<typename T, size_t N>
void foo(array<T, N> src) { ... }
...
foo({1, 2, 3})
I'm currently running GCC 4.8...
Yocum asked 30/6, 2013 at 7:52
1
Solved
The following snippet compiles fine in vc++ and clang++, but fails on gcc (inc 9.2) unless i add an explicit cast. Which compiler is right here?
#include <initializer_list>
template<typ...
Lux asked 29/12, 2019 at 8:9
2
Solved
This is a follow-up of this question: Is it legal to declare a constexpr initializer_list object?.
Since C++14, the std::initializer_list class has all of its methods marked with constexpr. It see...
Lanie asked 16/12, 2014 at 1:16
5
Solved
Why is std::initializer_list<_E>::size not allowable in a static_assert, even though it's declared as a constexpr in my libstdc++ (v. 4.6)?
For example, the following code:
template<class ...
Merchantman asked 25/3, 2011 at 22:12
3
Solved
I have a limited knowledge about c++. I tried to compile a c++ library and when I run the make file for the following header file
mcmc_dhs.h
#include <algorithm>
#include <map>
// intr...
Larynx asked 11/5, 2015 at 22:47
8
Solved
Am I allowed to move elements out of a std::initializer_list<T>?
#include <initializer_list>
#include <utility>
template<typename T>
void foo(std::initializer_list<T>...
Ramon asked 19/11, 2011 at 9:26
2
Simple question, does std::initializer_list heap allocate memory? I'm not talking about its element items, just the buffer itself to store the elements.
Esperance asked 15/5, 2020 at 17:57
1
Solved
I am trying to return the max value using the max function but its not working on 3 values.
CodeBlocks Error:
error: '__comp' cannot be used as a function
The Code:
#include <iost...
Nystrom asked 8/5, 2020 at 21:27
1
Solved
I am missing something with std::make_shared. Can't it resolve the type of a std::initializer_list, or am I doing something else wrong?
#include <vector>
#include <memory>
class A {};...
Dentation asked 6/4, 2020 at 11:40
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