Keep order of fields as they are added, not sorting alphabetically · open-source-parsers/jsoncpp#1202

(21 评论) (7 反应) (0 负责人)C++ (7,542 star) (2,602 fork)batch import

enhancementhelp wanted

描述

To use json files in a context where human readability makes sense, order of the fields insertion can make sense. As jsoncpp is sorting them alphabetically, it becomes hard to read the file and find related fields in ddifferent ends of the object. For example Json::Value root; root["name"] = "Test;" root["host"] = "127.0.0.1"; root["port"] = 80;

would be nice to have printed as

{ "name" : "Test, "host" : "127.0.0.1", "port" : 80 }

and not as

{ "host" : "127.0.0.1", "name" : "Test, "port" : 80 }

I actually succeeded to have this feature by replacing a container used by Json::Value with a custom one.

贡献者指南

技术栈: cpp
领域: backend
议题类型: feature
难度: 3
预计时间: half day
活动状态: stale
清晰度: clear
前置要求: C++ knowledgejsoncpp internals
新手友好度: 45
研究方向: Investigate the internal storage of Json::Value, likely currently using std::map which sorts keys alphabetically. The issue proposes replacing with an ordered container (e.g., std::vector of key value pairs or boost::container::flat map) to preserve insertion order. Review comments in issue #1202 for proposed implementations and potential performance trade offs. Key files to examine: include/json/value.h and src/lib json/json value.cpp.