select_paths.md

jsoncons::jsonpath::jsonpath_expression::select

std::vector<basic_json_location<char_type>> select_paths(const_reference root,
    result_options options = result_options::nodups | result_options::sort);                                                 (1) (since 0.172.0)

(1) Evaluates the root value against the compiled JSONPath expression and returns the locations of the selected values in the root value.

Parameters

root	Root JSON value
options (since 0.161.0)	Result options, a bitmask of type result_options

Examples

Return locations of selected values

#include <jsoncons/json.hpp>
#include <jsoncons_ext/jsonpath/jsonpath.hpp>

using json = jsoncons::json;
namespace jsonpath = jsoncons::jsonpath;

int main()
{
    auto expr = jsoncons::jsonpath::make_expression<json>("$.books[*]");

    std::ifstream is(/*path_to_books_file*/);
    json doc = json::parse(is);

    std::vector<jsonpath::json_location> paths = expr.select_paths(doc);
    for (const auto& path : paths)
    {
        std::cout << jsonpath::to_string(path) << "\n";
    }
}

Output:

[
  $['books'][0]
  $['books'][1]
  $['books'][2]
  $['books'][3]
]