Re: The D Programming Language
Walter Bright wrote:
James Kanze wrote:
Walter Bright wrote:
The C++98 Standard defines many operations on complex as taking an
argument of type complex&. That means taking a pointer to it, which puts
the kibosh on enregistering complex.
In a naive implementation.
That would include 100% of current implementations.
#include <complex>
inline std::complex<double> f( int x )
{
return std::complex<double>( x, 0 );
}
int main()
{
return ( f( 1 ) + f( 2 ) ).real();
}
Compiler output: (MSVC 8)
_main PROC
; 10 : return ( f( 1 ) + f( 2 ) ).real();
mov eax, 3
; 11 : }
ret 0
_main ENDP
If I make it
int main()
{
return ( f( 1 ) + f( rand() ) ).real();
}
the result is less convincing:
_main PROC
; 10 : {
push ecx
; 11 : return ( f( 1 ) + f( rand() ) ).real();
call _rand
mov DWORD PTR tv147[esp+4], eax
fild DWORD PTR tv147[esp+4]
fadd QWORD PTR __real@3ff0000000000000
; 12 : }
add esp, 4
; 11 : return ( f( 1 ) + f( rand() ) ).real();
jmp __ftol2_sse
_main ENDP
but still no complex<> in sight. One must make sure to use the static
runtime, though; the DLL runtime has complex<>::operator+ as an
exported function, which is an odd decision.
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