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Programming-Idioms

History of Idiom 209 > diff from v11 to v12

Edit summary for version 12 by hose:
New C++ implementation by user [hose]
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Version 11

2020-03-20, 17:33:26

Version 12

2021-08-16, 10:03:39

Idiom #209 Type with automatic deep deallocation

Declare a type t which contains a string s and an integer array n with variable size, and allocate a variable v of type t. Allocate v.s and v.n and set them to the values "Hello, world!" for s and [1,4,9,16,25], respectively. Deallocate v, automatically deallocating v.s and v.n (no memory leaks).

Idiom #209 Type with automatic deep deallocation

Declare a type t which contains a string s and an integer array n with variable size, and allocate a variable v of type t. Allocate v.s and v.n and set them to the values "Hello, world!" for s and [1,4,9,16,25], respectively. Deallocate v, automatically deallocating v.s and v.n (no memory leaks).

Variables
t,s,n,v
Code 
#include <string>
using namespace std::string_literals;
#include <vector>
#include <memory>

struct t {
    std::string s;
    std::vector<int> n;
};

auto v = std::make_unique<t>("Hello, world!"s, decltype(t::n){1, 4, 9, 16, 25});

v.reset();
Comments bubble
v.reset() is explicit deallocation, the object is also automatically deallocated when it goes out of scope.
Doc URL
https://en.cppreference.com/w/cpp/memory/unique_ptr/make_unique