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### jsoncons::jsonpath::jsonpath_expression::select
```cpp
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
<table>
<tr>
<td>root</td>
<td>Root JSON value</td>
</tr>
<tr>
<td><code>options</code> (since 0.161.0)</td>
<td>Result options, a bitmask of type <a href="../result_options.md">result_options</></td>
</tr>
</table>
### Examples
#### Return locations of selected values
```cpp
#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]
]
```
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