From b6c0cf9683736dffbad7a48016d2b08878102371 Mon Sep 17 00:00:00 2001
From: Victor Zverovich <victor.zverovich@gmail.com>
Date: Wed, 18 May 2016 19:54:52 -0700
Subject: [PATCH] Add fmt::to_string (#326)

---
 doc/api.rst         |  2 ++
 fmt/CMakeLists.txt  |  4 ++--
 fmt/string.h        | 34 ++++++++++++++++++++++++++++++++++
 test/CMakeLists.txt |  4 +++-
 test/string-test.cc | 15 +++++++++++++++
 5 files changed, 56 insertions(+), 3 deletions(-)
 create mode 100644 fmt/string.h
 create mode 100644 test/string-test.cc

diff --git a/doc/api.rst b/doc/api.rst
index 75dc03ac..4ed9ae8a 100644
--- a/doc/api.rst
+++ b/doc/api.rst
@@ -181,6 +181,8 @@ Utilities
 .. doxygenclass:: fmt::ArgList
    :members:
 
+.. doxygenfunction:: fmt::to_string(const T&)
+
 .. doxygenclass:: fmt::BasicStringRef
    :members:
 
diff --git a/fmt/CMakeLists.txt b/fmt/CMakeLists.txt
index c0ef02e5..083652df 100644
--- a/fmt/CMakeLists.txt
+++ b/fmt/CMakeLists.txt
@@ -1,12 +1,12 @@
 # Define the fmt library, its includes and the needed defines.
 # format.cc is added to FMT_HEADERS for the header-only configuration.
-set(FMT_HEADERS format.h format.cc ostream.h ostream.cc time.h)
+set(FMT_HEADERS format.h format.cc ostream.h ostream.cc string.h time.h)
 if (HAVE_OPEN)
   set(FMT_HEADERS ${FMT_HEADERS} posix.h)
   set(FMT_SOURCES ${FMT_SOURCES} posix.cc)
 endif ()
 
-add_library(fmt ${FMT_SOURCES} ${FMT_HEADERS} ../ChangeLog.rst)
+add_library(fmt ${FMT_SOURCES} ${FMT_HEADERS} ../README.rst ../ChangeLog.rst)
 
 option(FMT_CPPFORMAT "Build cppformat library for backward compatibility." OFF)
 if (FMT_CPPFORMAT)
diff --git a/fmt/string.h b/fmt/string.h
new file mode 100644
index 00000000..f50d8b45
--- /dev/null
+++ b/fmt/string.h
@@ -0,0 +1,34 @@
+/*
+ Formatting library for C++ - string utilities
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ For the license information refer to format.h.
+ */
+
+#ifndef FMT_STRING_H_
+#define FMT_STRING_H_
+
+#include "format.h"
+
+namespace fmt {
+
+/**
+  \rst
+  Converts *value* to ``std::string`` using the default format for type *T*.
+
+  **Example**::
+
+    std::string answer = fmt::to_string(42);
+  \endrst
+ */
+template <typename T>
+std::string to_string(const T &value) {
+  fmt::MemoryWriter w;
+  w << value;
+  return w.str();
+}
+}
+
+#endif  // FMT_STRING_H_
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index e4e868d5..618c1221 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -77,6 +77,7 @@ add_fmt_test(format-test)
 add_fmt_test(format-impl-test)
 add_fmt_test(ostream-test)
 add_fmt_test(printf-test)
+add_fmt_test(string-test)
 add_fmt_test(util-test mock-allocator.h)
 add_fmt_test(macro-test)
 
@@ -87,7 +88,8 @@ if (FMT_PEDANTIC AND MSVC)
 endif ()
 
 if (HAVE_OPEN)
-  add_executable(posix-mock-test posix-mock-test.cc ../fmt/format.cc ${TEST_MAIN_SRC})
+  add_executable(posix-mock-test
+    posix-mock-test.cc ../fmt/format.cc ${TEST_MAIN_SRC})
   target_include_directories(posix-mock-test PRIVATE ${PROJECT_SOURCE_DIR})
   target_compile_definitions(posix-mock-test PRIVATE FMT_USE_FILE_DESCRIPTORS=1)
   target_link_libraries(posix-mock-test gmock)
diff --git a/test/string-test.cc b/test/string-test.cc
new file mode 100644
index 00000000..5ef8877c
--- /dev/null
+++ b/test/string-test.cc
@@ -0,0 +1,15 @@
+/*
+ Tests of string utilities
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ For the license information refer to format.h.
+ */
+
+#include "fmt/string.h"
+#include "gtest/gtest.h"
+
+TEST(StringTest, ToString) {
+  EXPECT_EQ("42", fmt::to_string(42));
+}