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### jsoncons::jmespath::make_expression
```cpp
#include <jsoncons_ext/jmespath/jmespath.hpp>
template <typename Json>
jmespath_expression<Json> make_expression(const json::string_view_type& expr); (until 1.0.0)
(1)
template <typename Json>
jmespath_expression<Json> make_expression(const Json::string_view_type& expr, (since 1.0.0)
const custom_functions<Json>& funcs = custom_functions<Json>());
template <typename Json>
jmespath_expression<Json> make_expression(const json::string_view_type& expr, (2)
std::error_code& ec);
template <typename Json>
jmespath_expression<Json> make_expression(const Json::string_view_type& expr, (3) (since 1.0.0)
const custom_functions<Json>& funcs,
std::error_code& ec)
```
Returns a compiled JMESPath expression for later evaluation.
#### Parameters
<table>
<tr>
<td>expr</td>
<td>JMESPath expression</td>
</tr>
<tr>
<td>funcs</td>
<td>Custom functions</td>
</tr>
<tr>
<td>ec</td>
<td>out-parameter for reporting errors in the non-throwing overload</td>
</tr>
</table>
#### Return value
Returns a `jmespath_expression` object that represents the JMESPath expression.
#### Exceptions
(1) Throws a [jmespath_error](jmespath_error.md) if JMESPath compilation fails.
(2) Sets the out-parameter `ec` to the [jmespath_error_category](jmespath_errc.md) if JMESPath compilation fails.
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