mismatch

auto eve::algo::mismatch = function_with_traits<mismatch_>[find_if.get_traits()]

inlineconstexpr

#include <eve/module/algo/algo/mismatch.hpp>

Finds the point where two ranges are different (accepts anything that zips together as a range of 2 things). By default aligns and unrolls 4 times.

Alternative Header

#include <eve/algo.hpp>

Callable Signatures

namespace eve::algo
{
 
  template <zipped_range_pair Rng>
  auto mismatch(Rng&& rng) -> unalinged_t<decltype(rng.begin())>;       // 1
 
  template <zipped_range_pair Rng, typename P>
  auto mismatch(Rng&& rng, P p) -> unalinged_t<decltype(rng.begin())>;  // 2
 
  template<typename R1, typename R2>
  auto mismatch(R1&& r1, R2&& r2) requires zip_to_range<R1, R2>         // 3
     -> eve::views::zip_iterator;
 
  template<typename R1, typename R2, typename P>
  auto mismatch(R1&& r1, R2&& r2, P p) requires zip_to_range<R1, R2>    // 4
     -> eve::views::zip_iterator;
}

1. Compare both halves of zipped_range_pair for equality
2. Compare both halves of zipped_range_pair for equivalence using predicate P
3. Compare r1 and r2 that zip together to zip_range_pair for equality
4. Compare r1 and r2 that zip together to zip_range_pair for equivalence using predicate P

Note

1. and 3. will convert to common type to do equality comparison if necessary to get the same for custom predicate, use [common_type] trait on your zip.

to better understand the zip interfaces, have a look at examples/algorithms/using_existing/memcmp_... or examples/algorithms/using_existing/case_insensitive....

Parameters

• rng: zipped pair of 2 ranges to compare
• 'r1,r2- two separate components thatzipto azipped_range_pair ! *p- binary predicate for equivelence testing. ! ! **Return value** ! !eve::views::zip_iterator` to the place where the mismatch happend. (if not found, will point past the end of both halves).

Example

#include <eve/module/core.hpp>
#include <eve/module/algo.hpp>
#include <iostream>
#include <vector>
#include <tts/tts.hpp>
 
int main()
{
  std::vector<int>  v = {2,5,-9,  9,  3,-8,2,-5,7,-2,3};
  std::vector<int>  w = {2,5,-9, -9, -9,-8,2,-5,7,-2,3};
 
  std::cout << " -> v                             = "
            << tts::as_string(v)
            << "\n";
 
  std::cout << " -> w                             = "
            << tts::as_string(w)
            << "\n";
 
  auto [vv, ww] = eve::algo::mismatch(v, w);
  std::cout << " <- auto [vv, ww]                 = eve::algo::mismatch(v, ww);\n";
  std::cout << " -> mismatch at " << eve::read(vv) << " != " << eve::read(ww) << std::endl;
 
  // ignoring sign
  auto [no_sign_vv, no_sign_ww] = eve::algo::mismatch(v, w, [](auto x, auto y) {
    return x == y || x == -y;
  });
 
  std::cout << " <- auto [no_sign_vv, no_sign_ww] = eve::algo::mismatch(v, w, [](...){ });\n";
  std::cout << " -> mismatch at " << eve::read(no_sign_vv) << " != " << eve::read(no_sign_ww) << std::endl;
}