C++ pass reference to function inside same class
I am developing an embedded system with the mbed framework in C++.
To attach an interrupt function to the serial interrupt, I normally do this:
Serial pc(pin_u_tx, pin_u_rx,115200);
void SerialStart(void) {
...
pc.attach(&SerInt);
...
}
void SerInt(){
...
}
But now I need to do the same thing from inside a class, and it doesn't work as I can't refer to an internal function:
CTCOMM::CTCOMM()
{
pc = new Serial(ser_tx, ser_rx, ser_baud);
pc->attach(&serial_interrupt);
}
void CTCOMM::serial_interrupt() {
...
}
I tried a few ways, but none works:
pc->attach(&serial_interrupt);
gives the error
libCTcommctcomm.cpp:12:17: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function. Say '&CTCOMM::serial_interrupt' [-fpermissive]
pc->attach(*serial_interrupt);
gives the error
libCTcommctcomm.cpp:12:17: error: invalid use of member function 'void CTCOMM::serial_interrupt()' (did you forget the '
pc->attach(*serial_interrupt());
gives the error
libCTcommctcomm.cpp:12:33: error: void value not ignored as it ought to be ()' ?)
pc->attach((*this)->*(serial_interrupt));
gives the error
libCTcommctcomm.cpp:12:23: error: invalid use of non-static member function 'void CTCOMM::serial_interrupt()'
and so on (I tried more suggestions found here, but got no succes).
What would be the correct way to point to that function?
c++ class pointers mbed
asked Nov 25 '18 at 19:53
MGGMGG
5319
add a comment |
I am developing an embedded system with the mbed framework in C++.
To attach an interrupt function to the serial interrupt, I normally do this:
Serial pc(pin_u_tx, pin_u_rx,115200);
void SerialStart(void) {
...
pc.attach(&SerInt);
...
}
void SerInt(){
...
}
But now I need to do the same thing from inside a class, and it doesn't work as I can't refer to an internal function:
CTCOMM::CTCOMM()
{
pc = new Serial(ser_tx, ser_rx, ser_baud);
pc->attach(&serial_interrupt);
}
void CTCOMM::serial_interrupt() {
...
}
I tried a few ways, but none works:
pc->attach(&serial_interrupt);
gives the error
libCTcommctcomm.cpp:12:17: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function. Say '&CTCOMM::serial_interrupt' [-fpermissive]
pc->attach(*serial_interrupt);
gives the error
libCTcommctcomm.cpp:12:17: error: invalid use of member function 'void CTCOMM::serial_interrupt()' (did you forget the '
pc->attach(*serial_interrupt());
gives the error
libCTcommctcomm.cpp:12:33: error: void value not ignored as it ought to be ()' ?)
pc->attach((*this)->*(serial_interrupt));
gives the error
libCTcommctcomm.cpp:12:23: error: invalid use of non-static member function 'void CTCOMM::serial_interrupt()'
and so on (I tried more suggestions found here, but got no succes).
What would be the correct way to point to that function?
c++ class pointers mbed
asked Nov 25 '18 at 19:53
MGGMGG
5319
I think you don't have a choice here, as you need a pointer to a function. The only way is to use a static method.
– Matthieu Brucher
Nov 25 '18 at 19:59
What is the signature ofattach? Can you modify it to use, e.g.,std::invoketo call a callback function? Then you could passthisas the first argument to call a member function, something likeattach(&CTCOMM::serial_interrupt, this).
– Evg
Nov 25 '18 at 20:06
search for "pointer to member function"
– Kenny Ostrom
Nov 25 '18 at 20:45
add a comment |
I am developing an embedded system with the mbed framework in C++.
To attach an interrupt function to the serial interrupt, I normally do this:
Serial pc(pin_u_tx, pin_u_rx,115200);
void SerialStart(void) {
...
pc.attach(&SerInt);
...
}
void SerInt(){
...
}
But now I need to do the same thing from inside a class, and it doesn't work as I can't refer to an internal function:
CTCOMM::CTCOMM()
{
pc = new Serial(ser_tx, ser_rx, ser_baud);
pc->attach(&serial_interrupt);
}
void CTCOMM::serial_interrupt() {
...
}
I tried a few ways, but none works:
pc->attach(&serial_interrupt);
gives the error
libCTcommctcomm.cpp:12:17: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function. Say '&CTCOMM::serial_interrupt' [-fpermissive]
pc->attach(*serial_interrupt);
gives the error
libCTcommctcomm.cpp:12:17: error: invalid use of member function 'void CTCOMM::serial_interrupt()' (did you forget the '
pc->attach(*serial_interrupt());
gives the error
libCTcommctcomm.cpp:12:33: error: void value not ignored as it ought to be ()' ?)
pc->attach((*this)->*(serial_interrupt));
gives the error
libCTcommctcomm.cpp:12:23: error: invalid use of non-static member function 'void CTCOMM::serial_interrupt()'
and so on (I tried more suggestions found here, but got no succes).
What would be the correct way to point to that function?
c++ class pointers mbed
asked Nov 25 '18 at 19:53
MGGMGG
5319
I am developing an embedded system with the mbed framework in C++.
To attach an interrupt function to the serial interrupt, I normally do this:
Serial pc(pin_u_tx, pin_u_rx,115200);
void SerialStart(void) {
...
pc.attach(&SerInt);
...
}
void SerInt(){
...
}
But now I need to do the same thing from inside a class, and it doesn't work as I can't refer to an internal function:
CTCOMM::CTCOMM()
{
pc = new Serial(ser_tx, ser_rx, ser_baud);
pc->attach(&serial_interrupt);
}
void CTCOMM::serial_interrupt() {
...
}
I tried a few ways, but none works:
pc->attach(&serial_interrupt);
gives the error
libCTcommctcomm.cpp:12:17: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function. Say '&CTCOMM::serial_interrupt' [-fpermissive]
pc->attach(*serial_interrupt);
gives the error
libCTcommctcomm.cpp:12:17: error: invalid use of member function 'void CTCOMM::serial_interrupt()' (did you forget the '
pc->attach(*serial_interrupt());
gives the error
libCTcommctcomm.cpp:12:33: error: void value not ignored as it ought to be ()' ?)
pc->attach((*this)->*(serial_interrupt));
gives the error
libCTcommctcomm.cpp:12:23: error: invalid use of non-static member function 'void CTCOMM::serial_interrupt()'
and so on (I tried more suggestions found here, but got no succes).
What would be the correct way to point to that function?
c++ class pointers mbed
c++ class pointers mbed
asked Nov 25 '18 at 19:53
MGGMGG
5319
asked Nov 25 '18 at 19:53
MGGMGG
5319
asked Nov 25 '18 at 19:53
MGGMGG
5319
asked Nov 25 '18 at 19:53
MGGMGG
5319
asked Nov 25 '18 at 19:53
MGGMGG
5319
5319
I think you don't have a choice here, as you need a pointer to a function. The only way is to use a static method.
– Matthieu Brucher
Nov 25 '18 at 19:59
What is the signature ofattach? Can you modify it to use, e.g.,std::invoketo call a callback function? Then you could passthisas the first argument to call a member function, something likeattach(&CTCOMM::serial_interrupt, this).
– Evg
Nov 25 '18 at 20:06
search for "pointer to member function"
– Kenny Ostrom
Nov 25 '18 at 20:45
add a comment |
I think you don't have a choice here, as you need a pointer to a function. The only way is to use a static method.
– Matthieu Brucher
Nov 25 '18 at 19:59
What is the signature ofattach? Can you modify it to use, e.g.,std::invoketo call a callback function? Then you could passthisas the first argument to call a member function, something likeattach(&CTCOMM::serial_interrupt, this).
– Evg
Nov 25 '18 at 20:06
search for "pointer to member function"
– Kenny Ostrom
Nov 25 '18 at 20:45
I think you don't have a choice here, as you need a pointer to a function. The only way is to use a static method.
– Matthieu Brucher
Nov 25 '18 at 19:59
I think you don't have a choice here, as you need a pointer to a function. The only way is to use a static method.
– Matthieu Brucher
Nov 25 '18 at 19:59
What is the signature of
attach? Can you modify it to use, e.g., std::invoke to call a callback function? Then you could pass this as the first argument to call a member function, something like attach(&CTCOMM::serial_interrupt, this).– Evg
Nov 25 '18 at 20:06
What is the signature of
attach? Can you modify it to use, e.g., std::invoke to call a callback function? Then you could pass this as the first argument to call a member function, something like attach(&CTCOMM::serial_interrupt, this).– Evg
Nov 25 '18 at 20:06
search for "pointer to member function"
– Kenny Ostrom
Nov 25 '18 at 20:45
search for "pointer to member function"
– Kenny Ostrom
Nov 25 '18 at 20:45
add a comment |
1 Answer
1
active
oldest
votes
Try this.
pc->attach(callback(this, &CTCOMM::serial_interrupt));
pc->attach(this, &CTCOMM::serial_interrupt); should also work. But it is deprecated in the recent versions of mbed OS.
Here is the latest Mbed API:
https://os.mbed.com/docs/v5.10/mbed-os-api-doxy/classmbed_1_1_serial.html
answered Nov 25 '18 at 23:49
Kentaro OkudaKentaro Okuda
5214
First one gives this error:libCTcommctcomm.cpp:13:56: error: cannot convert 'CTCOMM*' to 'unsigned char*' in argument passingbut the second one works, only with a warning that it's deprecated! I'll try to fix the first one, but for now thanks, it works.
– MGG
Nov 26 '18 at 9:47
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
Try this.
pc->attach(callback(this, &CTCOMM::serial_interrupt));
pc->attach(this, &CTCOMM::serial_interrupt); should also work. But it is deprecated in the recent versions of mbed OS.
Here is the latest Mbed API:
https://os.mbed.com/docs/v5.10/mbed-os-api-doxy/classmbed_1_1_serial.html
answered Nov 25 '18 at 23:49
Kentaro OkudaKentaro Okuda
5214
First one gives this error:libCTcommctcomm.cpp:13:56: error: cannot convert 'CTCOMM*' to 'unsigned char*' in argument passingbut the second one works, only with a warning that it's deprecated! I'll try to fix the first one, but for now thanks, it works.
– MGG
Nov 26 '18 at 9:47
add a comment |
Try this.
pc->attach(callback(this, &CTCOMM::serial_interrupt));
pc->attach(this, &CTCOMM::serial_interrupt); should also work. But it is deprecated in the recent versions of mbed OS.
Here is the latest Mbed API:
https://os.mbed.com/docs/v5.10/mbed-os-api-doxy/classmbed_1_1_serial.html
answered Nov 25 '18 at 23:49
Kentaro OkudaKentaro Okuda
5214
First one gives this error:libCTcommctcomm.cpp:13:56: error: cannot convert 'CTCOMM*' to 'unsigned char*' in argument passingbut the second one works, only with a warning that it's deprecated! I'll try to fix the first one, but for now thanks, it works.
– MGG
Nov 26 '18 at 9:47
add a comment |
Try this.
pc->attach(callback(this, &CTCOMM::serial_interrupt));
pc->attach(this, &CTCOMM::serial_interrupt); should also work. But it is deprecated in the recent versions of mbed OS.
Here is the latest Mbed API:
https://os.mbed.com/docs/v5.10/mbed-os-api-doxy/classmbed_1_1_serial.html
answered Nov 25 '18 at 23:49
Kentaro OkudaKentaro Okuda
5214
Try this.
pc->attach(callback(this, &CTCOMM::serial_interrupt));
pc->attach(this, &CTCOMM::serial_interrupt); should also work. But it is deprecated in the recent versions of mbed OS.
Here is the latest Mbed API:
https://os.mbed.com/docs/v5.10/mbed-os-api-doxy/classmbed_1_1_serial.html
answered Nov 25 '18 at 23:49
Kentaro OkudaKentaro Okuda
5214
answered Nov 25 '18 at 23:49
Kentaro OkudaKentaro Okuda
5214
answered Nov 25 '18 at 23:49
Kentaro OkudaKentaro Okuda
5214
answered Nov 25 '18 at 23:49
Kentaro OkudaKentaro Okuda
5214
5214
First one gives this error:libCTcommctcomm.cpp:13:56: error: cannot convert 'CTCOMM*' to 'unsigned char*' in argument passingbut the second one works, only with a warning that it's deprecated! I'll try to fix the first one, but for now thanks, it works.
– MGG
Nov 26 '18 at 9:47
add a comment |
First one gives this error:libCTcommctcomm.cpp:13:56: error: cannot convert 'CTCOMM*' to 'unsigned char*' in argument passingbut the second one works, only with a warning that it's deprecated! I'll try to fix the first one, but for now thanks, it works.
– MGG
Nov 26 '18 at 9:47
First one gives this error:
libCTcommctcomm.cpp:13:56: error: cannot convert 'CTCOMM*' to 'unsigned char*' in argument passing but the second one works, only with a warning that it's deprecated! I'll try to fix the first one, but for now thanks, it works.– MGG
Nov 26 '18 at 9:47
First one gives this error:
libCTcommctcomm.cpp:13:56: error: cannot convert 'CTCOMM*' to 'unsigned char*' in argument passing but the second one works, only with a warning that it's deprecated! I'll try to fix the first one, but for now thanks, it works.– MGG
Nov 26 '18 at 9:47
add a comment |
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I think you don't have a choice here, as you need a pointer to a function. The only way is to use a static method.
– Matthieu Brucher
Nov 25 '18 at 19:59
What is the signature of
attach? Can you modify it to use, e.g.,std::invoketo call a callback function? Then you could passthisas the first argument to call a member function, something likeattach(&CTCOMM::serial_interrupt, this).– Evg
Nov 25 '18 at 20:06
search for "pointer to member function"
– Kenny Ostrom
Nov 25 '18 at 20:45