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module runme;
import tango.io.Stdout;
static import example;
extern(C) int add(int a, int b) {
return a + b;
}
extern(C) int sub(int a, int b) {
return a - b;
}
extern(C) int mul(int a, int b) {
return a * b;
}
void main() {
int a = 37;
int b = 42;
Stdout( "a = " )( a ).newline;
Stdout( "b = " )( b ).newline;
Stdout( "Trying some C callback functions:" ).newline;
Stdout( " ADD(a,b) = " )( example.do_op( a, b, example.ADD ) ).newline;
Stdout( " SUB(a,b) = " )( example.do_op( a, b, example.SUB ) ).newline;
Stdout( " MUL(a,b) = " )( example.do_op( a, b, example.MUL ) ).newline;
version (LDC) {
// Currently, there is no way to specify the calling convention for
// function pointer parameters in D, but LDC does strict typechecking for
// them (which is reasonable, but not covered by the language spec yet).
// As a result, there is no way to make the code below compile with LDC at
// the moment, so just skip it.
} else {
Stdout( "Now the same with callback functions defined in D:" ).newline;
Stdout( " add(a,b) = " )( example.do_op( a, b, &add ) ).newline;
Stdout( " sub(a,b) = " )( example.do_op( a, b, &sub ) ).newline;
Stdout( " mul(a,b) = " )( example.do_op( a, b, &mul ) ).newline;
}
}
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