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C++ : Compare

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Compare , .

, Compare, contextually converted bool, true strict weak ordering relation false .

BinaryPredicate, , , const , const const ( C++20).

T Compare

  • comp, T
  • equiv(a, b), , !comp(a, b) && !comp(b, a)

comp(a, b) implicitly convertible bool strict weak ordering
  • a, comp(a,a)==false
  • comp(a,b)==true, comp(b,a)==false
  • comp(a,b)==true comp(b,c)==true comp(a,c)==true
equiv(a, b) bool
  • a, equiv(a,a)==true
  • equiv(a,b)==true, equiv(b,a)==true
  • equiv(a,b)==true equiv(b,c)==true, equiv(a,c)==true

: comp strict total ordering , equiv

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Comparison operators <, <=, >, >=, ==, !=, and <=> (C++20), compare the arguments
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