關於c++使用toml plusplus(俗稱toml++)的使用(3)

連結

• toml++ - github
  

• toml++ - 幫助文件
  

• 使用要求： c++ 17 及以上版本

• toml語法-英文

• toml語法-中文

toml讀取

• 參見官方給出的範例

toml寫入

目標： 陣列的寫入

檔案內容

[NET_INTERFACE]
bool = false
bool_arr = [ false, false ]
complex_arr = [ false, '456', 123 ]
integer = 1234567890
integer_arr = [ 1, 0 ]
str_arr = [ '1', '0' ]
string = 'this is a string'

[[fruit]]
kilograms = 2
name = 'banana'

[[fruit]]
kilograms = 1
name = 'apple'

[[fruit]]
kilograms = 3
name = 'blueberry'

關鍵程式碼

• arrayInsert 函式定義

/// @brief 陣列的插入
/// @tparam T 
/// @param arr 
/// @param value 
template<typename T>
static void arrayInsert(toml::array& arr, const T& value)
{
    arr.insert(arr.begin(), toml::value<T>(value));
}

寫檔案程式碼

NetInterfaceConfigPropertyName propertyName;
toml::table rootNode{};
tableNodeInsert<std::string>(rootNode, "string", "this is a string");
tableNodeInsert<bool>(rootNode, "bool", false);
tableNodeInsert<int64_t>(rootNode, "integer", 1234567890);

toml::table netInterfaceNode{};
/// 建立[NET_INTERFACE]
netInterfaceNode.insert_or_assign(propertyName.m_tableName, rootNode);

/// 下一是一個陣列的寫入
 
{
	/// 定義了水果資訊
	struct FruitInfo
	{
		/// 水果的名稱
		std::string     m_name{""};
		/// 水果的重量
		int64_t         m_kilograms{0};
	};

	/// <key-水果的名稱，value-水果資訊>
	using HashFruitInfo = std::unordered_map<std::string, FruitInfo>;

	HashFruitInfo fruitInfoHash{{"apple", {"apple", 1}}, {"banana", {"banana", 2}}, {"blueberry", {"blueberry", 3}}};


	toml::array tmpArr;
	// for(auto& [key, value] : tmpArr)
	for (HashFruitInfo::iterator it = fruitInfoHash.begin(); it != fruitInfoHash.end(); ++ it)
	{
		toml::table tblTmp{};
		tableNodeInsert<std::string>(tblTmp, "name", it->first);
		tableNodeInsert<int64_t>(tblTmp, "kilograms", it->second.m_kilograms);

		tmpArr.insert(tmpArr.begin(), tblTmp);
	}

	/// 將陣列中的內容
	netInterfaceNode.insert_or_assign("fruit", tmpArr);
}

/// 陣列的寫入
{
	/// 整數陣列
	toml::array tmpArrInt;
	/// 字串陣列
	toml::array tmpArrStr;
	/// bool陣列
	toml::array tmpArrBool;

	for (int index = 0; index < 2; ++ index)
	{
		arrayInsert<int64_t>(tmpArrInt, index);
		arrayInsert<std::string>(tmpArrStr, std::to_string(index));
		arrayInsert<bool>(tmpArrBool, false);
	}

	netInterfaceNode[propertyName.m_tableName].as_table()->insert_or_assign("integer_arr", tmpArrInt);
	netInterfaceNode[propertyName.m_tableName].as_table()->insert_or_assign("str_arr", tmpArrStr);
	netInterfaceNode[propertyName.m_tableName].as_table()->insert_or_assign("bool_arr", tmpArrBool);


	/// 混合陣列
	toml::array tmpArrComplex;
	arrayInsert<int64_t>(tmpArrComplex, 123);
	arrayInsert<std::string>(tmpArrComplex, "456");
	arrayInsert<bool>(tmpArrComplex, false);

	netInterfaceNode[propertyName.m_tableName].as_table()->insert_or_assign("complex_arr", tmpArrComplex);

}


/// 使用流開啟檔案
std::ofstream tomlFile(std::string{"example.toml"}, std::ios::out | std::ios::trunc);
if (tomlFile.is_open())
{
	// 使用 toml++ 的內建方法將 TOML 值寫入檔案
	tomlFile << netInterfaceNode;
	tomlFile.close();
}
else
{
	/// TODO
}

陣列寫入的關鍵程式碼

        /// 陣列的寫入
        {
            /// 整數陣列
            toml::array tmpArrInt;
            /// 字串陣列
            toml::array tmpArrStr;
            /// bool陣列
            toml::array tmpArrBool;

            for (int index = 0; index < 2; ++ index)
            {
                arrayInsert<int64_t>(tmpArrInt, index);
                arrayInsert<std::string>(tmpArrStr, std::to_string(index));
                arrayInsert<bool>(tmpArrBool, false);
            }

            netInterfaceNode[propertyName.m_tableName].as_table()->insert_or_assign("integer_arr", tmpArrInt);
            netInterfaceNode[propertyName.m_tableName].as_table()->insert_or_assign("str_arr", tmpArrStr);
            netInterfaceNode[propertyName.m_tableName].as_table()->insert_or_assign("bool_arr", tmpArrBool);


            /// 混合陣列
            toml::array tmpArrComplex;
            arrayInsert<int64_t>(tmpArrComplex, 123);
            arrayInsert<std::string>(tmpArrComplex, "456");
            arrayInsert<bool>(tmpArrComplex, false);

            netInterfaceNode[propertyName.m_tableName].as_table()->insert_or_assign("complex_arr", tmpArrComplex);

        }