如何从 boost 属性 树中读取字段类型

Question

我正在使用 boost 属性 树从 json 文件中读取值。

{
    "some_values":
    {
        "field_1":  "value_1",
        "field_2":  true
    }
}

我可以读取值：

spTree->get<string>("some_values.field_1",  "");
spTree->get<bool>("some_values.field_2",    false);

但是我可以读取存储在任何给定字段中的变量类型吗？

Answer 1

Documentation says

[...] the following JSON / property tree mapping is used:

[...] 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.

所以如果您打算使用 JSON 解析器，除非您编写自己的代码或添加额外的元数据，否则没有办法。