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@kgbook
Last active November 15, 2018 18:34
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[boost variant example]boost::variant example #boost #variant
#include <boost/variant.hpp>
#include <string>
#include <iostream>
using data_t = boost::variant<
bool,
int8_t,
uint8_t,
int16_t,
uint16_t,
int32_t,
uint32_t,
int64_t,
uint64_t,
float,
double,
std::string>;
enum class DataType { /* use type_t */
kBool,
kInt8,
kUint8,
kInt16,
kUint16,
kInt32,
kUint32,
kInt64,
kUint64,
kFloat,
kDouble,
kString,
kSize /* not type, denote the size */
};
using type_t = DataType;
template <class T>
bool getBaseData(type_t type, data_t param, T& t) {
switch (type) {
case type_t::kBool: {
t = boost::get<bool>(param);
break;
}
case type_t::kInt8: {
t = boost::get<int8_t>(param);
break;
}
case type_t::kUint8: {
t = boost::get<uint8_t>(param);
break;
}
case type_t::kInt16: {
t = boost::get<int16_t>(param);
break;
}
case type_t::kUint16: {
t = boost::get<uint16_t>(param);
break;
}
case type_t::kInt32: {
t = boost::get<int32_t>(param);
break;
}
case type_t::kUint32: {
t = boost::get<uint32_t>(param);
break;
}
case type_t::kInt64: {
t = boost::get<int64_t>(param);
break;
}
case type_t::kUint64: {
t = boost::get<uint64_t>(param);
break;
}
case type_t::kString: {
// t = boost::get<std::string>(param);
break;
}
default: {
return false;
}
}
return true;
}
void getStringData(type_t type, data_t param, std::string &str) {
str = boost::get<std::string>(param);
}
int main()
{
data_t stringData = "hello";
data_t doubleData = 3.1415926;
double dData;
std::string strData;
getBaseData(type_t::kDouble, doubleData, dData);
getStringData(type_t::kString, stringData, strData);
std::cout <<"dData:" <<dData <<", strData:" <<strData <<std::endl;
return 0;
}
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