Here is an example code snippet that demonstrates how a custom copy constructor can be utilized to form a std::vector of a class that consists of a std::ofstream:
#include <iostream>
#include <fstream>
#include <vector>
class MyClass {
public:
MyClass(const std::string& filename) : file(filename) {}
// custom copy constructor
MyClass(const MyClass& other) : file(other.file.rdbuf()->clone()) {}
void write(const std::string& str) {
file << str << std::endl;
}
private:
std::ofstream file;
};
int main() {
std::vector<MyClass> v;
v.emplace_back("file1.txt");
v.emplace_back("file2.txt");
v[0].write("This is written to file1");
v[1].write("This is written to file2");
return 0;
}
In this example, the MyClass class represents a custom class that has an std::ofstream member variable called file. The custom copy constructor of MyClass uses the std::streambuf::clone() function to clone the underlying stream buffer of the ofstream object in the other object. This ensures that when copying the object, a new ofstream object is created with a new stream buffer, instead of just copying the pointer to the existing stream buffer.
The main function creates a vector of MyClass objects and adds two objects to it, each with a different output file. It then writes a line to each file using the write member function of the MyClass class.
Asked: 2023-05-26 01:34:31 +0000
Seen: 9 times
Last updated: May 26 '23