关于c++使用toml plusplus(俗称toml++)的使用(3)

链接

• toml++ - github
  

• toml++ - 帮助文档
  

• 使用要求： c++ 17 及以上版本

• toml语法-英文

• toml语法-中文

toml读取

• 参见官方给出的范例

toml写入

目标： 数组的写入

文件内容

[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'

关键代码

• arrayInsert 函数定义

/// @brief 数组的插入
/// @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));
}

写文件代码

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{};
/// 创建[NET_INTERFACE]
netInterfaceNode.insert_or_assign(propertyName.m_tableName, rootNode);

/// 下一是一个数组的写入
 
{
	/// 定义了水果信息
	struct FruitInfo
	{
		/// 水果的名称
		std::string     m_name{""};
		/// 水果的重量
		int64_t         m_kilograms{0};
	};

	/// <key-水果的名称，value-水果信息>
	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);
	}

	/// 将数组中的内容
	netInterfaceNode.insert_or_assign("fruit", tmpArr);
}

/// 数组的写入
{
	/// 整数数组
	toml::array tmpArrInt;
	/// 字符串数组
	toml::array tmpArrStr;
	/// bool数组
	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);


	/// 混合数组
	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);

}


/// 使用流打开文件
std::ofstream tomlFile(std::string{"example.toml"}, std::ios::out | std::ios::trunc);
if (tomlFile.is_open())
{
	// 使用 toml++ 的内置方法将 TOML 值写入文件
	tomlFile << netInterfaceNode;
	tomlFile.close();
}
else
{
	/// TODO
}

数组写入的关键代码

        /// 数组的写入
        {
            /// 整数数组
            toml::array tmpArrInt;
            /// 字符串数组
            toml::array tmpArrStr;
            /// bool数组
            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);


            /// 混合数组
            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);

        }