← Patterns
Use RAII types
12345678910111213 | #include <map>
#include <memory>
#include <string>
#include <vector>
int main()
{
std::vector<int> vec = {1, 2, 3, 4, 5};
std::map<std::string, int> map = {{"Foo", 10}, {"Bar", 20}};
std::string str = "Some text";
std::unique_ptr<int> ptr1 = std::make_unique<int>(8);
std::shared_ptr<int> ptr2 = std::make_shared<int>(16);
} |
This pattern is licensed under the CC0 Public Domain Dedication.
Requires
c++98
or newer.
Intent
Avoid manual memory management to improve safety and reduce bugs and memory leaks.
Description
Every object created on lines 8–12 will internally manage some
dynamically allocated memory (allocated with the new keyword).
They are all, however, implemented such that they deallocate that
memory when they are destroyed. This practice is known as RAII.
The user of these classes does not need to perform manual memory
management, reducing the risk of memory leaks and other bugs. In
fact, the use of new and delete can be avoided entirely by
using these RAII types.
Likewise, it is good practice to ensure your own classes also implement the RAII idiom with the rule of five or rule of zero.
