added all_equal to algorithm

include/aare/algorithm.hpp

@@ -107,5 +107,16 @@ std::vector<T> cumsum(const std::vector<T>& vec) {
 }
 
 
+template <typename Container> bool all_equal(const Container &c) {
+    if (!c.empty() &&
+        std::all_of(begin(c), end(c),
+                    [c](const typename Container::value_type &element) {
+                        return element == c.front();
+                    }))
+        return true;
+    return false;
+}
+
+
 
 } // namespace aare

src/RawFile.cpp

@@ -1,4 +1,5 @@
 #include "aare/RawFile.hpp"
+#include "aare/algorithm.hpp"
 #include "aare/PixelMap.hpp"
 #include "aare/defs.hpp"
 #include "aare/logger.hpp"
@@ -200,9 +201,7 @@ void RawFile::get_frame_into(size_t frame_index, std::byte *frame_buffer, Detect
         }
 
         // 1. if frame number vector is the same break
-        while (std::adjacent_find(frame_numbers.begin(), frame_numbers.end(),
-                                  std::not_equal_to<>()) !=
-               frame_numbers.end()) {
+        while (!all_equal(frame_numbers)) {
 
             // 2. find the index of the minimum frame number,
             auto min_frame_idx = std::distance(

src/algorithm.test.cpp

@@ -168,3 +168,28 @@ TEST_CASE("cumsum on an empty vector", "[algorithm]") {
     REQUIRE(result.size() == 0);
 
 }
+
+TEST_CASE("All equal on an empty vector is false", "[algorithm]") {
+    std::vector<int> vec = {};
+    REQUIRE(aare::all_equal(vec) == false);
+}
+
+TEST_CASE("All equal on a vector with 1 element is true", "[algorithm]") {
+    std::vector<int> vec = {1};
+    REQUIRE(aare::all_equal(vec) == true);
+}
+
+TEST_CASE("All equal on a vector with 2 elements is true", "[algorithm]") {
+    std::vector<int> vec = {1, 1};
+    REQUIRE(aare::all_equal(vec) == true);
+}
+
+TEST_CASE("All equal on a vector with two different  elements is false", "[algorithm]") {
+    std::vector<int> vec = {1, 2};
+    REQUIRE(aare::all_equal(vec) == false);
+}
+
+TEST_CASE("Last element is different", "[algorithm]") {
+    std::vector<int> vec = {1, 1, 1, 1, 2};
+    REQUIRE(aare::all_equal(vec) == false);
+}