From 4f54739ab6a65f93851f0568c31cecc10f9b2325 Mon Sep 17 00:00:00 2001
From: King_DuckZ <king_duckz@gmx.com>
Date: Thu, 30 Apr 2020 21:09:53 +0200
Subject: [PATCH] Add substr() method. It looks correct to me. Fingers crossed!

---
 src/wren/string_bt.hpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/wren/string_bt.hpp b/src/wren/string_bt.hpp
index 39def96..3fe671c 100644
--- a/src/wren/string_bt.hpp
+++ b/src/wren/string_bt.hpp
@@ -48,6 +48,7 @@ namespace dhandy {
 			constexpr string<S + S2 - 1, Ch> operator+ ( const string<S2, Ch>& parOther ) const;
 			constexpr value_type operator[] ( std::size_t parIndex ) const;
 			constexpr bool operator== (const string<S, Ch>& other) const;
+			template <std::size_t Start, std::size_t Len=S-1> constexpr auto substr() const;
 			template <std::size_t S2> constexpr bool operator== (const string<S2, Ch>&) const { return false; }
 
 			template <typename... Args>
@@ -122,6 +123,12 @@ namespace dhandy {
 		constexpr bool string<S, Ch>::operator== (const string<S, Ch>& other) const {
 			return implem::eq(*this, other);
 		}
+
+		template <std::size_t S, typename Ch>
+		template <std::size_t Start, std::size_t Len>
+		constexpr auto string<S, Ch>::substr() const {
+			return string<std::min(S - 1 - std::min(Start, S - 1), Len) + 1, Ch>(m_data + std::min(Start, S - 1)) + make_string("");
+		}
 	} //namespace bt
 } //namespace dhandy