Add ke::EraseIf for pre-C++20 code.

Author: dvander

Diff for: amtl/am-vector.h

@@ -1,4 +1,4 @@
-// vim: set sts=8 ts=2 sw=2 tw=99 et:
+// vim: set sts=8 ts=4 sw=4 tw=99 et:
 //
 // Copyright (C) 2013, David Anderson and AlliedModders LLC
 // All rights reserved.
@@ -31,6 +31,7 @@
 
 #include <stddef.h>
 
+#include <algorithm>
 #include <vector>
 
 namespace ke {
@@ -73,4 +74,10 @@ static inline void EmplaceAt(std::vector<T>* vec, size_t at, Args&&... item) {
     vec->emplace(vec->begin() + at, std::forward<Args>(item)...);
 }
 
+template <typename T, typename A, typename Pred>
+static inline void EraseIf(std::vector<T, A>* vec, Pred pred) {
+    auto it = std::remove_if(vec->begin(), vec->end(), pred);
+    vec->erase(it, vec->end());
+}
+
 } // namespace ke

Diff for: tests/test-vector.cpp

@@ -304,3 +304,14 @@ TEST(Vector, Remove) {
     EXPECT_EQ(thing1->refcount, (size_t)1);
     EXPECT_EQ(thing2->refcount, (size_t)1);
 }
+
+TEST(Vector, EraseIf) {
+    std::vector<int> items = {1, 2, 3, 4, 5};
+    ke::EraseIf(&items, [](int item) -> bool {
+        return item % 2 == 0;
+    });
+    EXPECT_EQ(items.size(), (size_t)3);
+    EXPECT_EQ(items[0], 1);
+    EXPECT_EQ(items[1], 3);
+    EXPECT_EQ(items[2], 5);
+}