std::unique_ptr<Json::CharReader> jsonReader{ readerBuilder.newCharReader()};

This line of code creates a new `std::unique_ptr` object named `jsonReader`, which is a smart pointer that owns and manages a dynamically allocated `Json::CharReader` object. The `newCharReader()` function is called on an instance of `Json::CharReaderBuilder`, which returns a pointer to a new `Json::CharReader` object. The `std::unique_ptr` takes ownership of this object and will automatically delete it when it goes out of scope.

相关问题

vector<unique_ptr>

vector<unique_ptr>是一个存储unique_ptr的动态数组，其中每个元素都是一个unique_ptr对象，每个对象都拥有独特的所有权。unique_ptr是一个智能指针，它提供了对动态分配对象的所有权和管理。当unique_ptr超出范围时，它将自动删除其所拥有的对象。下面是一个vector<unique_ptr>的例子：

#include <iostream>
#include <vector>
#include <memory>

int main() {
    std::vector<std::unique_ptr<int>> vec;
    vec.push_back(std::make_unique<int>(1));
    vec.push_back(std::make_unique<int>(2));
    vec.push_back(std::make_unique<int>(3));

    for (const auto& ptr : vec) {
        std::cout << *ptr << " ";
    }
    // 输出：1 2 3

    return 0;
}