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Select struct definition from multiple ones based on platform
The Next CEO of Stack OverflowPartial class definition on C++?How can friend function be declared for only one particular function and class?Mutual class instances in C++Platform Independence with C++. Detection and CompilationBool sorted insert function with check if int already exist in listWhy does microsoft use so many macros in their C++ code?C++: Cross reference in subclassesNot default destructor causes incomplete type errorWhy am I getting multiple definition error when header included?#ifdef [true condition] #endif block. Commenting out #ifdef & #endif lines changes compile?
Is it possible to have one struct, but two definitions, where the definition is selected via a #define macro? For example:
platform.h
struct Context;
platform_win32.cc:
#include "platform.h"
struct Context
// win32 specific implementation..
bool win;
platform_linux.cc:
#include "platform.h"
struct Context
//Linux specific implementation..
bool lin;
platform.cc:
#define WIN32 //For testing reasons
#ifdef WIN32
#include "platform_win32.cc"
#endif
#ifdef LINUX
#include "platform_linux.cc"
#endif
main.cc:
#include "platform.h"
int main()
Context *context = new Context;
context->win=true;
return 0;
But, this does not compile and returns:
error: invalid use of incomplete type 'struct Context'
note: forward declaration of 'struct Context'
How do I fix this?
c++ api cross-platform
asked Mar 8 at 12:48
CryonicCryonic
135
add a comment |
Is it possible to have one struct, but two definitions, where the definition is selected via a #define macro? For example:
platform.h
struct Context;
platform_win32.cc:
#include "platform.h"
struct Context
// win32 specific implementation..
bool win;
platform_linux.cc:
#include "platform.h"
struct Context
//Linux specific implementation..
bool lin;
platform.cc:
#define WIN32 //For testing reasons
#ifdef WIN32
#include "platform_win32.cc"
#endif
#ifdef LINUX
#include "platform_linux.cc"
#endif
main.cc:
#include "platform.h"
int main()
Context *context = new Context;
context->win=true;
return 0;
But, this does not compile and returns:
error: invalid use of incomplete type 'struct Context'
note: forward declaration of 'struct Context'
How do I fix this?
c++ api cross-platform
asked Mar 8 at 12:48
CryonicCryonic
135
add a comment |
Is it possible to have one struct, but two definitions, where the definition is selected via a #define macro? For example:
platform.h
struct Context;
platform_win32.cc:
#include "platform.h"
struct Context
// win32 specific implementation..
bool win;
platform_linux.cc:
#include "platform.h"
struct Context
//Linux specific implementation..
bool lin;
platform.cc:
#define WIN32 //For testing reasons
#ifdef WIN32
#include "platform_win32.cc"
#endif
#ifdef LINUX
#include "platform_linux.cc"
#endif
main.cc:
#include "platform.h"
int main()
Context *context = new Context;
context->win=true;
return 0;
But, this does not compile and returns:
error: invalid use of incomplete type 'struct Context'
note: forward declaration of 'struct Context'
How do I fix this?
c++ api cross-platform
asked Mar 8 at 12:48
CryonicCryonic
135
Is it possible to have one struct, but two definitions, where the definition is selected via a #define macro? For example:
platform.h
struct Context;
platform_win32.cc:
#include "platform.h"
struct Context
// win32 specific implementation..
bool win;
platform_linux.cc:
#include "platform.h"
struct Context
//Linux specific implementation..
bool lin;
platform.cc:
#define WIN32 //For testing reasons
#ifdef WIN32
#include "platform_win32.cc"
#endif
#ifdef LINUX
#include "platform_linux.cc"
#endif
main.cc:
#include "platform.h"
int main()
Context *context = new Context;
context->win=true;
return 0;
But, this does not compile and returns:
error: invalid use of incomplete type 'struct Context'
note: forward declaration of 'struct Context'
How do I fix this?
c++ api cross-platform
c++ api cross-platform
asked Mar 8 at 12:48
CryonicCryonic
135
asked Mar 8 at 12:48
CryonicCryonic
135
edited Mar 8 at 13:06
Cryonic
asked Mar 8 at 12:48
CryonicCryonic
135
asked Mar 8 at 12:48
CryonicCryonic
135
asked Mar 8 at 12:48
CryonicCryonic
135
135
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Firstly, the declare of type should be write into '.h' file, other than '.cc' or '.c' file.
Secondly, you can declare different type of struct for different platform by #define, like you did.
For example:
platform_win32.h:
struct Context
// win32 specific implementation..
bool field1;
bool field2;
bool field_win_specified;
platform_linux.h:
struct Context
//Linux specific implementation..
bool field1;
bool field2;
bool field_linux_specified;
platform.h:
#ifdef WIN32
#include "platform_win32.h"
#endif
#ifdef LINUX
#include "platform_linux.h"
#endif
main.cc:
#include "platform.h"
int main()
Context *context = new Context;
context->field1=true;
return 0;
answered Mar 8 at 13:10
YuanhuiYuanhui
307212
Bye the way, because we can not avoid to include a '.h' file more than one time, you should to define tokens to clear up these compiling error(s): e.g., in platform_linux.h file: ``` #ifndef PLATFORM_LINUX_H_ #define PLATFORM_LINUX_H_ //...... #endif // PLATFORM_LINUX_H__ ```
– Yuanhui
Mar 8 at 13:37
add a comment |
For forward-declare like struct Context;
The main rule is that you can only use where memory layout (and thus member functions and data members) do not need to be known in the file you forward-declare it.
Possible fix:
platform.h
#define WIN32 //For testing reasons
#ifdef WIN32
#include "platform_win32.h"
#endif
#ifdef LINUX
#include "platform_linux.h"
#endif
platform_win32.h
struct Context
// win32 specific implementation..
bool win;
platform_linux.h
struct Context
//Linux specific implementation..
bool lin;
main.cc
#include "platform.h"
int main()
Context *context = new Context;
context->win=true;
return 0;
answered Mar 8 at 13:11
C_RajC_Raj
1194
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Firstly, the declare of type should be write into '.h' file, other than '.cc' or '.c' file.
Secondly, you can declare different type of struct for different platform by #define, like you did.
For example:
platform_win32.h:
struct Context
// win32 specific implementation..
bool field1;
bool field2;
bool field_win_specified;
platform_linux.h:
struct Context
//Linux specific implementation..
bool field1;
bool field2;
bool field_linux_specified;
platform.h:
#ifdef WIN32
#include "platform_win32.h"
#endif
#ifdef LINUX
#include "platform_linux.h"
#endif
main.cc:
#include "platform.h"
int main()
Context *context = new Context;
context->field1=true;
return 0;
answered Mar 8 at 13:10
YuanhuiYuanhui
307212
Bye the way, because we can not avoid to include a '.h' file more than one time, you should to define tokens to clear up these compiling error(s): e.g., in platform_linux.h file: ``` #ifndef PLATFORM_LINUX_H_ #define PLATFORM_LINUX_H_ //...... #endif // PLATFORM_LINUX_H__ ```
– Yuanhui
Mar 8 at 13:37
add a comment |
Firstly, the declare of type should be write into '.h' file, other than '.cc' or '.c' file.
Secondly, you can declare different type of struct for different platform by #define, like you did.
For example:
platform_win32.h:
struct Context
// win32 specific implementation..
bool field1;
bool field2;
bool field_win_specified;
platform_linux.h:
struct Context
//Linux specific implementation..
bool field1;
bool field2;
bool field_linux_specified;
platform.h:
#ifdef WIN32
#include "platform_win32.h"
#endif
#ifdef LINUX
#include "platform_linux.h"
#endif
main.cc:
#include "platform.h"
int main()
Context *context = new Context;
context->field1=true;
return 0;
answered Mar 8 at 13:10
YuanhuiYuanhui
307212
Bye the way, because we can not avoid to include a '.h' file more than one time, you should to define tokens to clear up these compiling error(s): e.g., in platform_linux.h file: ``` #ifndef PLATFORM_LINUX_H_ #define PLATFORM_LINUX_H_ //...... #endif // PLATFORM_LINUX_H__ ```
– Yuanhui
Mar 8 at 13:37
add a comment |
Firstly, the declare of type should be write into '.h' file, other than '.cc' or '.c' file.
Secondly, you can declare different type of struct for different platform by #define, like you did.
For example:
platform_win32.h:
struct Context
// win32 specific implementation..
bool field1;
bool field2;
bool field_win_specified;
platform_linux.h:
struct Context
//Linux specific implementation..
bool field1;
bool field2;
bool field_linux_specified;
platform.h:
#ifdef WIN32
#include "platform_win32.h"
#endif
#ifdef LINUX
#include "platform_linux.h"
#endif
main.cc:
#include "platform.h"
int main()
Context *context = new Context;
context->field1=true;
return 0;
answered Mar 8 at 13:10
YuanhuiYuanhui
307212
Firstly, the declare of type should be write into '.h' file, other than '.cc' or '.c' file.
Secondly, you can declare different type of struct for different platform by #define, like you did.
For example:
platform_win32.h:
struct Context
// win32 specific implementation..
bool field1;
bool field2;
bool field_win_specified;
platform_linux.h:
struct Context
//Linux specific implementation..
bool field1;
bool field2;
bool field_linux_specified;
platform.h:
#ifdef WIN32
#include "platform_win32.h"
#endif
#ifdef LINUX
#include "platform_linux.h"
#endif
main.cc:
#include "platform.h"
int main()
Context *context = new Context;
context->field1=true;
return 0;
answered Mar 8 at 13:10
YuanhuiYuanhui
307212
answered Mar 8 at 13:10
YuanhuiYuanhui
307212
answered Mar 8 at 13:10
YuanhuiYuanhui
307212
answered Mar 8 at 13:10
YuanhuiYuanhui
307212
307212
Bye the way, because we can not avoid to include a '.h' file more than one time, you should to define tokens to clear up these compiling error(s): e.g., in platform_linux.h file: ``` #ifndef PLATFORM_LINUX_H_ #define PLATFORM_LINUX_H_ //...... #endif // PLATFORM_LINUX_H__ ```
– Yuanhui
Mar 8 at 13:37
add a comment |
Bye the way, because we can not avoid to include a '.h' file more than one time, you should to define tokens to clear up these compiling error(s): e.g., in platform_linux.h file: ``` #ifndef PLATFORM_LINUX_H_ #define PLATFORM_LINUX_H_ //...... #endif // PLATFORM_LINUX_H__ ```
– Yuanhui
Mar 8 at 13:37
Bye the way, because we can not avoid to include a '.h' file more than one time, you should to define tokens to clear up these compiling error(s): e.g., in platform_linux.h file: ``` #ifndef PLATFORM_LINUX_H_ #define PLATFORM_LINUX_H_ //...... #endif // PLATFORM_LINUX_H__ ```
– Yuanhui
Mar 8 at 13:37
Bye the way, because we can not avoid to include a '.h' file more than one time, you should to define tokens to clear up these compiling error(s): e.g., in platform_linux.h file: ``` #ifndef PLATFORM_LINUX_H_ #define PLATFORM_LINUX_H_ //...... #endif // PLATFORM_LINUX_H__ ```
– Yuanhui
Mar 8 at 13:37
add a comment |
For forward-declare like struct Context;
The main rule is that you can only use where memory layout (and thus member functions and data members) do not need to be known in the file you forward-declare it.
Possible fix:
platform.h
#define WIN32 //For testing reasons
#ifdef WIN32
#include "platform_win32.h"
#endif
#ifdef LINUX
#include "platform_linux.h"
#endif
platform_win32.h
struct Context
// win32 specific implementation..
bool win;
platform_linux.h
struct Context
//Linux specific implementation..
bool lin;
main.cc
#include "platform.h"
int main()
Context *context = new Context;
context->win=true;
return 0;
answered Mar 8 at 13:11
C_RajC_Raj
1194
add a comment |
For forward-declare like struct Context;
The main rule is that you can only use where memory layout (and thus member functions and data members) do not need to be known in the file you forward-declare it.
Possible fix:
platform.h
#define WIN32 //For testing reasons
#ifdef WIN32
#include "platform_win32.h"
#endif
#ifdef LINUX
#include "platform_linux.h"
#endif
platform_win32.h
struct Context
// win32 specific implementation..
bool win;
platform_linux.h
struct Context
//Linux specific implementation..
bool lin;
main.cc
#include "platform.h"
int main()
Context *context = new Context;
context->win=true;
return 0;
answered Mar 8 at 13:11
C_RajC_Raj
1194
add a comment |
For forward-declare like struct Context;
The main rule is that you can only use where memory layout (and thus member functions and data members) do not need to be known in the file you forward-declare it.
Possible fix:
platform.h
#define WIN32 //For testing reasons
#ifdef WIN32
#include "platform_win32.h"
#endif
#ifdef LINUX
#include "platform_linux.h"
#endif
platform_win32.h
struct Context
// win32 specific implementation..
bool win;
platform_linux.h
struct Context
//Linux specific implementation..
bool lin;
main.cc
#include "platform.h"
int main()
Context *context = new Context;
context->win=true;
return 0;
answered Mar 8 at 13:11
C_RajC_Raj
1194
For forward-declare like struct Context;
The main rule is that you can only use where memory layout (and thus member functions and data members) do not need to be known in the file you forward-declare it.
Possible fix:
platform.h
#define WIN32 //For testing reasons
#ifdef WIN32
#include "platform_win32.h"
#endif
#ifdef LINUX
#include "platform_linux.h"
#endif
platform_win32.h
struct Context
// win32 specific implementation..
bool win;
platform_linux.h
struct Context
//Linux specific implementation..
bool lin;
main.cc
#include "platform.h"
int main()
Context *context = new Context;
context->win=true;
return 0;
answered Mar 8 at 13:11
C_RajC_Raj
1194
answered Mar 8 at 13:11
C_RajC_Raj
1194
answered Mar 8 at 13:11
C_RajC_Raj
1194
answered Mar 8 at 13:11
C_RajC_Raj
1194
1194
add a comment |
add a comment |
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