C++ Json Boost value to string

Question

I have simple C++ code that uses Boost library:

auto jsonStringPtr = jsonValuePtr->if_string();

How can I convert this value to std::string without quotes?

I tested this code:

std::string myString = boost::json::serialize(*jsonStringPtr);

but it contains quotes e.g. "abc" insted of abc... Any idea?

#edit

Boost: v1.76.0
C++: 20

Example:

boost::json::error_code errorCode;
boost::json::value jsonValue = boost::json::parse("{\"fff\": \"abc\"}", errorCode);

auto jsonString = jsonValue.as_object()["fff"].as_string();
std::string myString = boost::json::serialize(jsonString);

Wouldn't that require `deserialze()` or something? – πάντα ῥεῖ Sep 21 '21 at 12:39 — πάντα ῥεῖ, Sep 21 '21 at 12:39
Does `*jsonStringPtr` do the trick? – SergeyA Sep 21 '21 at 13:58 — SergeyA, Sep 21 '21 at 13:58

score 6 · Answer 1 · answered Sep 21 '21 at 13:25

6

I found the solution:

boost::json::value_to<std::string>(jsonValue)

answered Sep 21 '21 at 13:25

montjet

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Note that it's probably fine to let `ADL` find that, so you don't have to write `boost::json::value_to` but just `value_to` – sehe Sep 21 '21 at 15:20
Note that ADL won't work on a function call with explicit template arguments on any C++ version prior to C++20: https://stackoverflow.com/questions/2953684/why-doesnt-adl-find-function-templates – Daniel Schepler Feb 17 '23 at 22:20

score 0 · Answer 2 · answered Jul 11 '22 at 14:19

0

auto jsonStringPtr = jsonValuePtr->as_string().c_str();

answered Jul 11 '22 at 14:19

Brian Waters

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C++ Json Boost value to string

2 Answers2