implement

Author: faithandbrave

README.md

@@ -1 +1,7 @@
-# coutln
+# coutln
+auto line-break cout.
+
+```cpp
+coutln << format("{}", value);
+```
+

coutln.h

@@ -0,0 +1,52 @@
+#pragma once
+// Copyright Akira Takahashi 2020
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#include <iostream>
+#include <utility>
+
+namespace io {
+
+struct coutln_t {};
+inline coutln_t coutln{};
+
+struct cerrln_t {};
+inline cerrln_t cerrln{};
+
+struct clogln_t {};
+inline clogln_t clogln{};
+
+struct wcoutln_t {};
+inline wcoutln_t wcoutln{};
+
+struct wcerrln_t {};
+inline wcerrln_t wcerrln{};
+
+struct wclogln_t {};
+inline wclogln_t wclogln{};
+
+
+#define DEFINE_OSTREAM_OPERATOR(type, os) \
+template <class T> \
+type& operator<<(type& out, const T& x) { \
+    os << x << std::endl; \
+    return out; \
+} \
+\
+template <class T> \
+type& operator<<(type& out, T&& x) { \
+    os << std::move(x) << std::endl; \
+    return out; \
+}
+
+DEFINE_OSTREAM_OPERATOR(coutln_t, std::cout);
+DEFINE_OSTREAM_OPERATOR(cerrln_t, std::cerr);
+DEFINE_OSTREAM_OPERATOR(clogln_t, std::clog);
+
+DEFINE_OSTREAM_OPERATOR(wcoutln_t, std::wcout);
+DEFINE_OSTREAM_OPERATOR(wcerrln_t, std::wcerr);
+DEFINE_OSTREAM_OPERATOR(wclogln_t, std::wclog);
+
+}

example.cpp

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+#include "coutln.h"
+
+int main() {
+    io::coutln << "Hello" << "World";
+    io::cerrln << "Hello" << "World";
+    io::clogln << "Hello" << "World";
+
+    io::wcoutln << "Hello" << "World";
+    io::wcerrln << "Hello" << "World";
+    io::wclogln << "Hello" << "World";
+}