#ifndef LYX_ALGO_H
#define LYX_ALGO_H
-#include <algorithm>
+#include <utility>
-using std::less;
+namespace lyx {
-// Both these functions should ideally be placed into namespace lyx.
-// Also the using std::less should not be used.
-
-//namespace lyx {
/// Returns true if the sequence first,last is sorted, false if not.
template <class For>
if (first == last) return true;
For tmp = first;
while (++tmp != last) {
- if (less(*tmp, *first++)) return false;
+ if (*tmp < *first++) return false;
}
return true;
}
+
/// Cmp is the same Cmp as you would pass to std::sort.
template <class For, class Cmp>
bool sorted(For first, For last, Cmp cmp)
return true;
}
-// } // end of namespace lyx
+
+struct firster {
+ template <class P1, class P2>
+ P1 operator()(std::pair<P1, P2> const & p) {
+ return p.first;
+ }
+};
+
+
+template <class InputIter, class OutputIter, class Func>
+OutputIter copy_if(InputIter first, InputIter last,
+ OutputIter result, Func func)
+{
+ for (; first != last; ++first) {
+ if (func(*first)) {
+ *result++ = *first;
+ }
+ }
+ return result;
+}
+
+} // end of namespace lyx
#endif