是否有一种方便的方法可以从属性树中删除节点，并保留其子节点？ [英] Is there a convenient way to erase a node from a property tree, preserving its child nodes?

问题描述

我想从boost属性树中删除一个节点，但是我想保留其子节点并将其连接到已删除节点的父节点（即其祖父母节点）。

I want to delete a node from a boost property tree, but I want to preserve its children and connect them to the parent of the deleted node (i.e. to their grandparent node). Is there an elegant way to achieve this?

推荐答案

这可能是移动孙辈的最有效方法：

This might be the most efficient way to move the grandchildren:

std::move(middle.begin(), middle.end(), back_inserter(parent));

完整样本

< kbd> 在Coliru上直播

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

using boost::property_tree::ptree;
using boost::property_tree::read_json;
using boost::property_tree::write_json;

int main() {

    std::istringstream iss(R"({ "a" : { "middle" : { "a1":1, "a2":2, "a3":3 }, "more":"stuff" } })");
    ptree pt;
    read_json(iss, pt);

    auto& parent = pt.get_child("a");
    auto& middle = pt.get_child("a.middle");

    std::move(middle.begin(), middle.end(), back_inserter(parent));
    parent.erase("middle");

    write_json(std::cout, pt);

}

示例json输出：

{
    "a": {
        "more": "stuff",
        "a1": "1",
        "a2": "2",
        "a3": "3"
    }
}

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