template
static bool parse_a_value(T& val, Json::Value json_val)
{
if(json_val.isNull()) return false;
if(typeid(val) == typeid(int)
|| typeid(val) == typeid(int16_t)
|| typeid(val) == typeid(int8_t)
|| typeid(val) == typeid(int32_t))
{
val = json_val.asInt();
}
if(typeid(val) == typeid(uint8_t)
|| typeid(val) == typeid(uint16_t)
|| typeid(val) == typeid(uint32_t))
{
val = json_val.asUInt();
}
if(typeid(val) == typeid(int64_t)) val = T(json_val.asInt64());
if(typeid(val) == typeid(uint64_t)) val = T(json_val.asUInt64());
if(typeid(val) == typeid(float)) val = T(json_val.asFloat());
if(typeid(val) == typeid(double)) val = T(json_val.asDouble());
// if(typeid(val) == typeid(std::string)) val = T(json_val.asString());
return true;
}
25行报错
./task_control: /usr/local/lib/libuuid.so.1: no version information available (required by ./task_control)
[2023-12-21 15:51:28.811] [console] [info] [main.cpp:138] =====>val type:i/6253375586064260614 NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE/5774750460303204477, false
^C
huanglidi@hld-vm:~/work/code/balcony/balcony_painting/spray_control/build$
huanglidi@hld-vm:~/work/code/balcony/balcony_painting/spray_control/build$ make -j8
Scanning dependencies of target task_control
[ 1%] Building CXX object CMakeFiles/task_control.dir/src/route_generate.cpp.o
/home/huanglidi/work/code/balcony/balcony_painting/spray_control/src/route_generate.cpp: In instantiation of ‘bool parse_a_value(T&, Json::Value) [with T = double]’:
/home/huanglidi/work/code/balcony/balcony_painting/spray_control/src/route_generate.cpp:83:49: required from here
/home/huanglidi/work/code/balcony/balcony_painting/spray_control/src/route_generate.cpp:70:48: error: invalid cast from type ‘std::__cxx11::string {aka std::__cxx11::basic_string<char>}’ to type ‘double’
if(typeid(val) == typeid(std::string)) val = T(json_val.asString());
^
/home/huanglidi/work/code/balcony/balcony_painting/spray_control/src/route_generate.cpp: In instantiation of ‘bool parse_a_value(T&, Json::Value) [with T = unsigned int]’:
/home/huanglidi/work/code/balcony/balcony_painting/spray_control/src/route_generate.cpp:87:47: required from here
/home/huanglidi/work/code/balcony/balcony_painting/spray_control/src/route_generate.cpp:70:48: error: invalid cast from type ‘std::__cxx11::string {aka std::__cxx11::basic_string<char>}’ to type ‘unsigned int’
CMakeFiles/task_control.dir/build.make:964: recipe for target 'CMakeFiles/task_control.dir/src/route_generate.cpp.o' failed
测试代码
#include <typeinfo>
template<typename T>
static bool parse_a_value(T& val,Json::Value &root)
{
bool b = (typeid(val) == typeid(std::string));
Rotating_Info("=====>val type:{}/{} {}/{}, {}", typeid(val).name(),
typeid(val).hash_code(),
typeid(std::string).name(), typeid(std::string).hash_code(), b);
if(b)
{
Rotating_Info("=====>1111");
// val = root.asString();
}
return true;
}
## 原因与解决方法?
标签:control,typeid,code,val,推导,json,bug,模板,balcony
From: https://www.cnblogs.com/HuangLiDi/p/18131527