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use std::tie() for macro-generated operators

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as written the comparisons generate copies, even though it looks as
though they shouldn't.

before:

  Time (mean ± σ):      4.396 s ±  0.002 s    [User: 3.894 s, System: 0.501 s]
  Range (min … max):    4.393 s …  4.399 s    10 runs

after:

  Time (mean ± σ):      4.260 s ±  0.003 s    [User: 3.754 s, System: 0.505 s]
  Range (min … max):    4.257 s …  4.266 s    10 runs
This commit is contained in:
pennae 2023-12-10 09:49:38 +01:00
parent 74c134914c
commit cc4038d541
3 changed files with 6 additions and 10 deletions
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4
src/libcmd/built-path.cc
View file

@ -12,9 +12,9 @@ namespace nix {
bool MY_TYPE ::operator COMPARATOR (const MY_TYPE & other) const \
{ \
const MY_TYPE* me = this; \
auto fields1 = std::make_tuple<const CHILD_TYPE &, const FIELD_TYPE &>(*me->drvPath, me->FIELD); \
auto fields1 = std::tie(*me->drvPath, me->FIELD); \
me = &other; \
auto fields2 = std::make_tuple<const CHILD_TYPE &, const FIELD_TYPE &>(*me->drvPath, me->FIELD); \
auto fields2 = std::tie(*me->drvPath, me->FIELD); \
return fields1 COMPARATOR fields2; \
}
#define CMP(CHILD_TYPE, MY_TYPE, FIELD) \