jsoncpp1.9.4源码解析

CharReaderBuilder

默认的设置：

void CharReaderBuilder::setDefaults(Json::Value* settings) {
  (*settings)["collectComments"] = true;                     // 解析和序列化的时候是否保留注释
  (*settings)["allowComments"] = true;                       // 是否允许注释
  (*settings)["allowTrailingCommas"] = true;                 // 
  (*settings)["strictRoot"] = false;                         // 根是否只能为array或者object
  (*settings)["allowDroppedNullPlaceholders"] = false;       //
  (*settings)["allowNumericKeys"] = false;                   // 是否允许数字作为key
  (*settings)["allowSingleQuotes"] = false;                  // 是否允许单引号 
  (*settings)["stackLimit"] = 1000;                          // json嵌套层数
  (*settings)["failIfExtra"] = false;                        // jsonvalue后面有非空白符时parse是否失败
  (*settings)["rejectDupKeys"] = false;                      // 是否拒绝object中重复的key
  (*settings)["allowSpecialFloats"] = false;                 // 是否允许特殊浮点数（NaN，Inf） 
  (*settings)["skipBom"] = true;                             // 
}

StreamWriterBuilder

默认的设置：

void StreamWriterBuilder::setDefaults(Json::Value* settings) {
  (*settings)["commentStyle"] = "All";
  (*settings)["indentation"] = "\t";
  (*settings)["enableYAMLCompatibility"] = false;
  (*settings)["dropNullPlaceholders"] = false;
  (*settings)["useSpecialFloats"] = false;
  (*settings)["emitUTF8"] = false;
  (*settings)["precision"] = 17;
  (*settings)["precisionType"] = "significant";
}