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Re: get_i [message #54250 is a reply to message #54247] Tue, 16 June 2020 17:45 Go to previous messageGo to previous message
Novo is currently offline  Novo
Messages: 1431
Registered: December 2006
Ultimate Contributor
Thank you.
I played a little bit with get_i and godbolt.org and got results below.
Test: const char* c = get_i(-1, "zero", "one", "two");
Assembly for the original code (-O2):
.LC0:
        .string "zero"
_GLOBAL__sub_I_c:
        mov     QWORD PTR c[rip], OFFSET FLAT:.LC0
        ret
c:
        .zero   8

I changes U++ code a little bit:
template <class T> constexpr const T& min(const T& a, const T& b) { return a < b ? a : b; }
template <class T> constexpr const T& max(const T& a, const T& b) { return a > b ? a : b; }

template <class T> // deprecated name, use clamp
constexpr T minmax(T x, T _min, T _max) { return min(max(x, _min), _max); }

template <class T>
constexpr T clamp(T x, T _min, T _max) { return minmax(x, _min, _max); }

inline constexpr const char *get_i(int i, const char *p0, __List##I(E__NFValue)) \

Resulting assenbly:
.LC0:
        .string "zero"
c:
        .quad   .LC0

Conclusion: "constexpr" is quite useful ...


Regards,
Novo
 
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