add literal operator for C strings

The literal operator allows to convert C strings into std::strings

src/common/CMakeLists.txt

@@ -54,7 +54,8 @@ set(common_sources
   password.cpp
   perf_timer.cpp
   threadpool.cpp
-  updates.cpp)
+  updates.cpp
+  string.cpp)
 
 if (STACK_TRACE)
   list(APPEND common_sources stack_trace.cpp)
@@ -64,6 +65,7 @@ set(common_headers)
 
 set(common_private_headers
   gulps.hpp
+  string.hpp
   apply_permutation.h
   base58.h
   boost_serialization_helper.h

src/common/string.cpp

@@ -0,0 +1,49 @@
+// Copyright (c) 2018, Ryo Currency Project
+//
+// Portions of this file are available under BSD-3 license. Please see ORIGINAL-LICENSE for details
+// All rights reserved.
+//
+// Authors and copyright holders give permission for following:
+//
+// 1. Redistribution and use in source and binary forms WITHOUT modification.
+//
+// 2. Modification of the source form for your own personal use.
+//
+// As long as the following conditions are met:
+//
+// 3. You must not distribute modified copies of the work to third parties. This includes
+//    posting the work online, or hosting copies of the modified work for download.
+//
+// 4. Any derivative version of this work is also covered by this license, including point 8.
+//
+// 5. Neither the name of the copyright holders nor the names of the authors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// 6. You agree that this licence is governed by and shall be construed in accordance
+//    with the laws of England and Wales.
+//
+// 7. You agree to submit all disputes arising out of or in connection with this licence
+//    to the exclusive jurisdiction of the Courts of England and Wales.
+//
+// Authors and copyright holders agree that:
+//
+// 8. This licence expires and the work covered by it is released into the
+//    public domain on 1st of February 2019
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#include <string>
+
+std::string operator ""_s(const char * str, size_t len) {
+    return std::string(str, len);
+}

src/common/string.hpp

@@ -0,0 +1,54 @@
+// Copyright (c) 2018, Ryo Currency Project
+//
+// Portions of this file are available under BSD-3 license. Please see ORIGINAL-LICENSE for details
+// All rights reserved.
+//
+// Authors and copyright holders give permission for following:
+//
+// 1. Redistribution and use in source and binary forms WITHOUT modification.
+//
+// 2. Modification of the source form for your own personal use.
+//
+// As long as the following conditions are met:
+//
+// 3. You must not distribute modified copies of the work to third parties. This includes
+//    posting the work online, or hosting copies of the modified work for download.
+//
+// 4. Any derivative version of this work is also covered by this license, including point 8.
+//
+// 5. Neither the name of the copyright holders nor the names of the authors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// 6. You agree that this licence is governed by and shall be construed in accordance
+//    with the laws of England and Wales.
+//
+// 7. You agree to submit all disputes arising out of or in connection with this licence
+//    to the exclusive jurisdiction of the Courts of England and Wales.
+//
+// Authors and copyright holders agree that:
+//
+// 8. This licence expires and the work covered by it is released into the
+//    public domain on 1st of February 2019
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma once
+
+#include <string>
+
+/** convert a C string into a C++ std::string
+ *
+ * @code{cpp}
+ * auto foo = "Hello World!"_s; // type of foo is std::string
+ * @endcode
+ */
+std::string operator ""_s(const char * str, size_t len);