Conversion operator overloading with template
I want to be able to convert myclass to any base structures (double, int, float, etc). I used:
template<class T> myclass::operator T()
return (T)a;
;
But it gives me an error when I run it. But if I use:
myclass::operator double()
return (double)a;
;
(a is a private variable) the code works.
How can I use template in this situation?
Thanks
templates overloading operator-keyword
asked Nov 14 '18 at 11:55
RodolfoRodolfo
1
add a comment |
I want to be able to convert myclass to any base structures (double, int, float, etc). I used:
template<class T> myclass::operator T()
return (T)a;
;
But it gives me an error when I run it. But if I use:
myclass::operator double()
return (double)a;
;
(a is a private variable) the code works.
How can I use template in this situation?
Thanks
templates overloading operator-keyword
asked Nov 14 '18 at 11:55
RodolfoRodolfo
1
add a comment |
I want to be able to convert myclass to any base structures (double, int, float, etc). I used:
template<class T> myclass::operator T()
return (T)a;
;
But it gives me an error when I run it. But if I use:
myclass::operator double()
return (double)a;
;
(a is a private variable) the code works.
How can I use template in this situation?
Thanks
templates overloading operator-keyword
asked Nov 14 '18 at 11:55
RodolfoRodolfo
1
I want to be able to convert myclass to any base structures (double, int, float, etc). I used:
template<class T> myclass::operator T()
return (T)a;
;
But it gives me an error when I run it. But if I use:
myclass::operator double()
return (double)a;
;
(a is a private variable) the code works.
How can I use template in this situation?
Thanks
templates overloading operator-keyword
templates overloading operator-keyword
asked Nov 14 '18 at 11:55
RodolfoRodolfo
1
asked Nov 14 '18 at 11:55
RodolfoRodolfo
1
asked Nov 14 '18 at 11:55
RodolfoRodolfo
1
asked Nov 14 '18 at 11:55
RodolfoRodolfo
1
asked Nov 14 '18 at 11:55
RodolfoRodolfo
1
1
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
For this to work at all, a must be convertible to double, int, and float. Then your first example should work just fine. I added extra enforcing by a static_assert.
#include <type_traits>
class myclass
double a = 1.0;
public:
template<class T> operator T()
static_assert(std::is_convertible_v<decltype(a),T>);
return static_cast<T>(a);
;
;
int main()
myclass m;
int i = m;
float f = m;
double d = m;
//std::string s = m; // BOOM!
Live on Wandbox
answered Nov 15 '18 at 4:23
Henri MenkeHenri Menke
7,70011328
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
For this to work at all, a must be convertible to double, int, and float. Then your first example should work just fine. I added extra enforcing by a static_assert.
#include <type_traits>
class myclass
double a = 1.0;
public:
template<class T> operator T()
static_assert(std::is_convertible_v<decltype(a),T>);
return static_cast<T>(a);
;
;
int main()
myclass m;
int i = m;
float f = m;
double d = m;
//std::string s = m; // BOOM!
Live on Wandbox
answered Nov 15 '18 at 4:23
Henri MenkeHenri Menke
7,70011328
add a comment |
For this to work at all, a must be convertible to double, int, and float. Then your first example should work just fine. I added extra enforcing by a static_assert.
#include <type_traits>
class myclass
double a = 1.0;
public:
template<class T> operator T()
static_assert(std::is_convertible_v<decltype(a),T>);
return static_cast<T>(a);
;
;
int main()
myclass m;
int i = m;
float f = m;
double d = m;
//std::string s = m; // BOOM!
Live on Wandbox
answered Nov 15 '18 at 4:23
Henri MenkeHenri Menke
7,70011328
add a comment |
For this to work at all, a must be convertible to double, int, and float. Then your first example should work just fine. I added extra enforcing by a static_assert.
#include <type_traits>
class myclass
double a = 1.0;
public:
template<class T> operator T()
static_assert(std::is_convertible_v<decltype(a),T>);
return static_cast<T>(a);
;
;
int main()
myclass m;
int i = m;
float f = m;
double d = m;
//std::string s = m; // BOOM!
Live on Wandbox
answered Nov 15 '18 at 4:23
Henri MenkeHenri Menke
7,70011328
For this to work at all, a must be convertible to double, int, and float. Then your first example should work just fine. I added extra enforcing by a static_assert.
#include <type_traits>
class myclass
double a = 1.0;
public:
template<class T> operator T()
static_assert(std::is_convertible_v<decltype(a),T>);
return static_cast<T>(a);
;
;
int main()
myclass m;
int i = m;
float f = m;
double d = m;
//std::string s = m; // BOOM!
Live on Wandbox
answered Nov 15 '18 at 4:23
Henri MenkeHenri Menke
7,70011328
edited Dec 2 '18 at 22:21
answered Nov 15 '18 at 4:23
Henri MenkeHenri Menke
7,70011328
answered Nov 15 '18 at 4:23
Henri MenkeHenri Menke
7,70011328
answered Nov 15 '18 at 4:23
Henri MenkeHenri Menke
7,70011328
7,70011328
add a comment |
add a comment |
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