Merge branch 'master' into ci

CMakeLists.txt

@@ -133,7 +133,7 @@ endfunction()
 
 # Define the fmt library, its includes and the needed defines.
 add_headers(FMT_HEADERS core.h format.h format-inl.h locale.h ostream.h printf.h
-                        time.h)
+                        time.h ranges.h)
 set(FMT_SOURCES src/format.cc)
 if (HAVE_OPEN)
   add_headers(FMT_HEADERS posix.h)

ChangeLog.rst

@@ -52,6 +52,27 @@
      <source>:12:45: error: expression '<throw-expression>' is not a constant expression
             throw format_error("invalid specifier");
 
+* Added `iterator support
+  <http://fmtlib.net/dev/api.html#output-iterator-support>`_:
+
+  .. code:: c++
+
+     #include <vector>
+     #include <fmt/format.h>
+
+     std::vector<char> out;
+     fmt::format_to(std::back_inserter(out), "{}", 42);
+
+* Added the `formatted_size
+  <http://fmtlib.net/dev/api.html#output-iterator-support>`_ function for
+  computing output size:
+
+  .. code:: c++
+
+     #include <fmt/format.h>
+
+     auto size = fmt::formatted_size("{}", 12345); // size == 5
+
 * Improved compile times by reducing dependencies on standard headers and
   providing a lightweight `core API <http://fmtlib.net/dev/api.html#core-api>`_:
 
@@ -94,6 +115,19 @@
   in the format API and provided ``fmt::string_view`` which implements a subset
   of ``std::string_view`` API for pre-C++17 systems.
 
+* Added support for ``std::experimental::string_view``
+  (`#607 <https://github.com/fmtlib/fmt/pull/607>`_):
+
+  .. code:: c++
+
+     #include <fmt/core.h>
+     #include <experimental/string_view>
+
+     fmt::print("{}", std::experimental::string_view("foo"));
+
+  Thanks `@virgiliofornazin (Virgilio Alexandre Fornazin)
+  <https://github.com/virgiliofornazin>`_.
+
 * Allowed mixing named and automatic arguments:
 
   .. code:: c++

doc/api.rst

@@ -151,6 +151,8 @@ The following user-defined literals are defined in ``fmt/format.h``.
 Utilities
 ---------
 
+.. doxygenfunction:: fmt::formatted_size(string_view, const Args&...)
+
 .. doxygenfunction:: fmt::to_string(const T&)
 
 .. doxygenfunction:: fmt::to_wstring(const T&)

include/fmt/core.h

@@ -73,7 +73,8 @@
 # endif
 #endif
 
-#if FMT_HAS_FEATURE(cxx_explicit_conversions)
+#if FMT_HAS_FEATURE(cxx_explicit_conversions) || \
+    FMT_MSC_VER >= 1800
 # define FMT_EXPLICIT explicit
 #else
 # define FMT_EXPLICIT
@@ -199,13 +200,11 @@ typename std::add_rvalue_reference<T>::type declval() FMT_NOEXCEPT;
 }
 
 /**
-  \rst
   An implementation of ``std::basic_string_view`` for pre-C++17. It provides a
   subset of the API. ``fmt::basic_string_view`` is used for format strings even
   if ``std::string_view`` is available to prevent issues when a library is
   compiled with a different ``-std`` option than the client code (which is not
   recommended).
-  \endrst
  */
 template <typename Char>
 class basic_string_view {
@@ -244,11 +243,7 @@ class basic_string_view {
   basic_string_view(const Char *s)
     : data_(s), size_(std::char_traits<Char>::length(s)) {}
 
-  /**
-    \rst
-    Constructs a string reference from a ``std::basic_string`` object.
-    \endrst
-   */
+  /** Constructs a string reference from a ``std::basic_string`` object. */
   template <typename Alloc>
   FMT_CONSTEXPR basic_string_view(
       const std::basic_string<Char, Alloc> &s) FMT_NOEXCEPT
@@ -335,11 +330,7 @@ class basic_buffer {
     capacity_ = capacity;
   }
 
-  /**
-    \rst
-    Increases the buffer capacity to hold at least *capacity* elements.
-    \endrst
-   */
+  /** Increases the buffer capacity to hold at least *capacity* elements. */
   virtual void grow(std::size_t capacity) = 0;
 
  public:
@@ -371,11 +362,7 @@ class basic_buffer {
     size_ = new_size;
   }
 
-  /**
-    \rst
-    Reserves space to store at least *capacity* elements.
-    \endrst
-   */
+  /** Reserves space to store at least *capacity* elements. */
   void reserve(std::size_t capacity) {
     if (capacity > capacity_)
       grow(capacity);
@@ -910,10 +897,8 @@ class basic_format_context :
   using typename base::iterator;
 
   /**
-   \rst
    Constructs a ``basic_format_context`` object. References to the arguments are
    stored in the object so make sure they have appropriate lifetimes.
-   \endrst
    */
   basic_format_context(OutputIt out, basic_string_view<char_type> format_str,
                 basic_format_args<basic_format_context> args)
@@ -997,8 +982,17 @@ class format_arg_store {
 
   friend class basic_format_args<Context>;
 
+  static FMT_CONSTEXPR uint64_t get_types() {
+    return IS_PACKED ? internal::get_types<Context, Args...>()
+                : -static_cast<int64_t>(NUM_ARGS);
+  }
+
  public:
+#if FMT_USE_CONSTEXPR
+  static constexpr uint64_t TYPES = get_types();
+#else
   static const uint64_t TYPES;
+#endif
 
 #if FMT_GCC_VERSION && FMT_GCC_VERSION <= 405
   // Workaround an array initialization bug in gcc 4.5 and earlier.
@@ -1011,10 +1005,10 @@ class format_arg_store {
 #endif
 };
 
+#if !FMT_USE_CONSTEXPR
 template <typename Context, typename ...Args>
-const uint64_t format_arg_store<Context, Args...>::TYPES = IS_PACKED ?
-    internal::get_types<Context, Args...>() :
-    -static_cast<int64_t>(NUM_ARGS);
+const uint64_t format_arg_store<Context, Args...>::TYPES = get_types();
+#endif
 
 /**
   \rst

include/fmt/format.h

@@ -1395,13 +1395,13 @@ class float_type_checker : private ErrorHandler {
   }
 };
 
-template <typename ErrorHandler>
+template <typename ErrorHandler, typename CharType>
 class char_specs_checker : public ErrorHandler {
  private:
-  char type_;
+  CharType type_;
 
  public:
-  FMT_CONSTEXPR char_specs_checker(char type, ErrorHandler eh)
+  FMT_CONSTEXPR char_specs_checker(CharType type, ErrorHandler eh)
     : ErrorHandler(eh), type_(type) {}
 
   FMT_CONSTEXPR void on_int() {
@@ -3138,8 +3138,10 @@ struct formatter<
             type_spec, internal::int_type_checker<decltype(eh)>(eh));
       break;
     case internal::char_type:
-      handle_char_specs(specs_, internal::char_specs_checker<decltype(eh)>(
-                          static_cast<char>(type_spec), eh));
+      handle_char_specs(
+          specs_,
+          internal::char_specs_checker<decltype(eh), decltype(type_spec)>(
+              type_spec, eh));
       break;
     case internal::double_type:
     case internal::long_double_type:
@@ -3419,9 +3421,7 @@ std::string to_string(const T &value) {
 }
 
 /**
-  \rst
   Converts *value* to ``std::wstring`` using the default format for type *T*.
-  \endrst
  */
 template <typename T>
 std::wstring to_wstring(const T &value) {
@@ -3478,6 +3478,17 @@ inline OutputIt vformat_to(OutputIt out, string_view format_str,
   return vformat_to<arg_formatter<range>>(range(out), format_str, args);
 }
 
+/**
+ \rst
+ Formats arguments, writes the result to the output iterator ``out`` and returns
+ the iterator past the end of the output range.
+
+ **Example**::
+
+   std::vector<char> out;
+   fmt::format_to(std::back_inserter(out), "{}", 42);
+ \endrst
+ */
 template <typename OutputIt, typename... Args>
 inline OutputIt format_to(OutputIt out, string_view format_str,
                           const Args & ... args) {
@@ -3552,7 +3563,10 @@ inline typename std::enable_if<internal::is_format_string<String>::value>::type
   return vprint(format_str.data(), make_format_args(args...));
 }
 
-// Counts the number of characters in the output of format(format_str, args...).
+/**
+ Returns the number of characters in the output of
+ ``format(format_str, args...)``.
+ */
 template <typename... Args>
 inline std::size_t formatted_size(string_view format_str,
                                   const Args & ... args) {