add clock

1 files changed, 10 insertions, 0 deletions

diff --git a/euler/include/std/string.hpp b/euler/include/std/string.hpp
index 505ee69..c5a3d99 100644
--- a/euler/include/std/string.hpp
+++ b/euler/include/std/string.hpp
@@ -12,6 +12,8 @@ namespace std {
     std::vector<char> characters;
 
   public:
+    static const size_t npos = (size_t)-1;
+
     constexpr string() : characters({'\0'}) {}
 
     constexpr string(const string &other)
@@ -74,6 +76,14 @@ namespace std {
       return characters[pos];
     }
 
+    constexpr string &erase(size_t index = 0, size_t count = npos) {
+      count = std::min(count, size() - index);
+      for (size_t i = index; i + count < size(); ++i)
+        characters[i] = characters[i + count];
+      resize(size() - count);
+      return *this;
+    }
+
   };
 
 }