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40 lines
1.0 KiB
C++
40 lines
1.0 KiB
C++
5 years ago
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// some helper functions to deal with JSON data
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#ifndef PEP_UTILS_JSON_HH
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#define PEP_UTILS_JSON_HH
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#include "json_spirit/json_spirit_utils.h"
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namespace pEp {
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namespace utility {
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// fetch a member from the given object, if set. (return a sensible NULL/default value if not)
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template<class T, js::Value_type VALUE_TYPE>
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T from_json_object(const js::Object& obj, const std::string& key)
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{
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const auto v = find_value(obj, key);
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if(v.type() == js::null_type) return T{};
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if(v.type() == VALUE_TYPE) return from_json<T>(v);
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throw std::runtime_error("JSON object has a member for key \"" + key + "\""
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" with incompatible type " + js::value_type_to_string( v.type())
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+ " instead of expected type " + js::value_type_to_string(VALUE_TYPE)
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);
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}
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template<class T>
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void to_json_object(js::Object& obj, const std::string& key, const T& value)
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{
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if(value!=T{})
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{
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obj.emplace_back( key, js::Value( to_json<T>(value) ));
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}
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}
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} // end of namespace pEp::utility
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} // end of namespace pEp
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#endif // PEP_UTILS_JSON_HH
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