如何提升 json 以使用正确的数据类型

Question

当我 put_value 使用 int 时，它被写为字符串。有谁知道如何让它打印为 int？

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

using boost::property_tree::ptree;
using namespace std;

int main(int argc, char* argv[]) {

    ptree node;
    node.put("string", "text here");
    node.put("int", 1);//outputs as "1" and should be 1
    write_json(cout, node, false);//{"string":"text here","int":"1"}

    return 0;
}

Answer 1

库明确不支持它。

Boost 属性库尚未命名 "Boost Json Library" 因为它不是 JSON 库。相反，它是一个属性树库（恰好使用 JSON 子集用于其目的）。

来自documentation：

The property tree dataset is not typed, and does not support arrays as such. Thus, the following JSON / property tree mapping is used:

JSON objects are mapped to nodes. Each property is a child node.

JSON arrays are mapped to nodes. Each element is a child node with an empty name. If a node has both named and unnamed child nodes, it cannot be mapped to a JSON representation.

JSON values are mapped to nodes containing the value. However, all type information is lost; numbers, as well as the literals "null", "true" and "false" are simply mapped to their string form.

Property tree nodes containing both child nodes and data cannot be mapped.

和

JSON round-trips, except for the type information loss.

如何提升 json 以使用正确的数据类型

how to get boost json to use the correct data types

c++

json

boost

boost-propertytree