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cppdraft/format/args.md

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+[format.args]
+
+# 28 Text processing library [[text]](./#text)
+
+## 28.5 Formatting [[format]](format#args)
+
+### 28.5.8 Arguments [[format.arguments]](format.arguments#format.args)
+
+#### 28.5.8.3 Class template basic_format_args [format.args]
+
+namespace std {template<class Context>class basic_format_args { size_t size_; // *exposition only*const basic_format_arg<Context>* data_; // *exposition only*public:template<class... Args> basic_format_args(const *format-arg-store*<Context, Args...>& store) noexcept;
+
+ basic_format_arg<Context> get(size_t i) const noexcept; }; template<class Context, class... Args> basic_format_args(*format-arg-store*<Context, Args...>) -> basic_format_args<Context>;}
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L8717)
+
+An instance of basic_format_args provides access to formatting
+arguments[.](#1.sentence-1)
+
+Implementations should
+optimize the representation of basic_format_args for a small number of formatting arguments[.](#1.sentence-2)
+
+[*Note [1](#note-1)*:
+
+For example, by storing indices of type alternatives separately from values
+and packing the former[.](#1.sentence-3)
+
+— *end note*]
+
+[🔗](#lib:basic_format_args,constructor)
+
+`template<class... Args>
+  basic_format_args(const format-arg-store<Context, Args...>& store) noexcept;
+`
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L8735)
+
+*Effects*: Initializessize_ with sizeof...(Args) anddata_ with store.args.data()[.](#2.sentence-1)
+
+[🔗](#lib:get,basic_format_args)
+
+`basic_format_arg<Context> get(size_t i) const noexcept;
+`
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L8748)
+
+*Returns*: i < size_ ? data_[i] : basic_format_arg<Context>()[.](#3.sentence-1)