noexcept while defining a share ptr [duplicate] - c++

Question

This question already has answers here:
Difference in make_shared and normal shared_ptr in C++
(8 answers)
Closed 3 months ago.
I got this error :
error: no matching function for call to 'Company::Company(Company*)'
145 | noexcept(noexcept(::new((void )__p)
| ^~~~~~~~~~~~~~~~~~ 146 | _Up(std::forward<_Args>(__args)...)))
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Test.cpp:20:5: note: candidate: 'Company::Company(int, int)' 20 | Company(int
companyId,int value):companyId(companyId),value(value){
| ^~~~~~~ Test.cpp:20:5: note: candidate expects 2 arguments, 1 provided Test.cpp:9:7: note: candidate: 'constexpr
Company::Company(const Company&)'
9 | class Company{
| ^~~~~~~ Test.cpp:9:7: note: no known conversion for argument 1 from 'Company' to 'const Company&' Test.cpp:9:7: note:
candidate: 'constexpr Company::Company(Company&&)' Test.cpp:9:7: note:
no known conversion for argument 1 from 'Company*' to 'Company&&'
The shared pointer gives me an error, I have no idea what the reason is, any idea please?
Code:
#include <iostream>
#include <string>
#include <memory>
using namespace std;
class Company{
public:
int companyId;
int value;
int HighestSalaryEmployee;
int highestSalary;
int LowestIDHighestSalaryEmployee;
int lowestSalary;
int numEmployees;
public:
Company(int companyId,int value):companyId(companyId),value(value){
HighestSalaryEmployee=11;
highestSalary=0;
LowestIDHighestSalaryEmployee=112;
numEmployees=0;
}
};
int main()
{
shared_ptr<Company> ptr1 = make_shared<Company>(new Company(123456,100));
}

Answer 1

This has nothing to do with noexcept and everything to do with using std::make_shared correctly. The way std::make_shared works is similar to how various emplace functions work: You pass the arguments used to construct the specified type, and it constructs them.
So what the error message is trying to tell you is that it's attempting to construct a Company out of a Company*, and Company doesn't have any constructors that go from a Company* to a Company.
The solution is to drop the new Company(...) and simply pass the arguments directly:
std::shared_ptr<Company> ptr1 = std::make_shared<Company>(123456,100);