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| Original file line number | Diff line number | Diff line change |
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| // Formatting library for C++ - dynamic format arguments | ||
| // | ||
| // Copyright (c) 2012 - present, Victor Zverovich | ||
| // All rights reserved. | ||
| // | ||
| // For the license information refer to format.h. | ||
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| #ifndef FMT_ARGS_H_ | ||
| #define FMT_ARGS_H_ | ||
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| #include <functional> // std::reference_wrapper | ||
| #include <memory> // std::unique_ptr | ||
| #include <vector> | ||
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| #include "core.h" | ||
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| FMT_BEGIN_NAMESPACE | ||
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| namespace detail { | ||
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| template <typename T> struct is_reference_wrapper : std::false_type {}; | ||
| template <typename T> | ||
| struct is_reference_wrapper<std::reference_wrapper<T>> : std::true_type {}; | ||
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| template <typename T> const T& unwrap(const T& v) { return v; } | ||
| template <typename T> const T& unwrap(const std::reference_wrapper<T>& v) { | ||
| return static_cast<const T&>(v); | ||
| } | ||
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| class dynamic_arg_list { | ||
| // Workaround for clang's -Wweak-vtables. Unlike for regular classes, for | ||
| // templates it doesn't complain about inability to deduce single translation | ||
| // unit for placing vtable. So storage_node_base is made a fake template. | ||
| template <typename = void> struct node { | ||
| virtual ~node() = default; | ||
| std::unique_ptr<node<>> next; | ||
| }; | ||
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| template <typename T> struct typed_node : node<> { | ||
| T value; | ||
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| template <typename Arg> | ||
| FMT_CONSTEXPR typed_node(const Arg& arg) : value(arg) {} | ||
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| template <typename Char> | ||
| FMT_CONSTEXPR typed_node(const basic_string_view<Char>& arg) | ||
| : value(arg.data(), arg.size()) {} | ||
| }; | ||
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| std::unique_ptr<node<>> head_; | ||
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| public: | ||
| template <typename T, typename Arg> const T& push(const Arg& arg) { | ||
| auto new_node = std::unique_ptr<typed_node<T>>(new typed_node<T>(arg)); | ||
| auto& value = new_node->value; | ||
| new_node->next = std::move(head_); | ||
| head_ = std::move(new_node); | ||
| return value; | ||
| } | ||
| }; | ||
| } // namespace detail | ||
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| /** | ||
| \rst | ||
| A dynamic version of `fmt::format_arg_store`. | ||
| It's equipped with a storage to potentially temporary objects which lifetimes | ||
| could be shorter than the format arguments object. | ||
| It can be implicitly converted into `~fmt::basic_format_args` for passing | ||
| into type-erased formatting functions such as `~fmt::vformat`. | ||
| \endrst | ||
| */ | ||
| template <typename Context> | ||
| class dynamic_format_arg_store | ||
| #if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 | ||
| // Workaround a GCC template argument substitution bug. | ||
| : public basic_format_args<Context> | ||
| #endif | ||
| { | ||
| private: | ||
| using char_type = typename Context::char_type; | ||
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| template <typename T> struct need_copy { | ||
| static constexpr detail::type mapped_type = | ||
| detail::mapped_type_constant<T, Context>::value; | ||
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| enum { | ||
| value = !(detail::is_reference_wrapper<T>::value || | ||
| std::is_same<T, basic_string_view<char_type>>::value || | ||
| std::is_same<T, detail::std_string_view<char_type>>::value || | ||
| (mapped_type != detail::type::cstring_type && | ||
| mapped_type != detail::type::string_type && | ||
| mapped_type != detail::type::custom_type)) | ||
| }; | ||
| }; | ||
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| template <typename T> | ||
| using stored_type = conditional_t< | ||
| std::is_convertible<T, std::basic_string<char_type>>::value && | ||
| !detail::is_reference_wrapper<T>::value, | ||
| std::basic_string<char_type>, T>; | ||
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| // Storage of basic_format_arg must be contiguous. | ||
| std::vector<basic_format_arg<Context>> data_; | ||
| std::vector<detail::named_arg_info<char_type>> named_info_; | ||
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| // Storage of arguments not fitting into basic_format_arg must grow | ||
| // without relocation because items in data_ refer to it. | ||
| detail::dynamic_arg_list dynamic_args_; | ||
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| friend class basic_format_args<Context>; | ||
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| unsigned long long get_types() const { | ||
| return detail::is_unpacked_bit | data_.size() | | ||
| (named_info_.empty() | ||
| ? 0ULL | ||
| : static_cast<unsigned long long>(detail::has_named_args_bit)); | ||
| } | ||
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| const basic_format_arg<Context>* data() const { | ||
| return named_info_.empty() ? data_.data() : data_.data() + 1; | ||
| } | ||
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| template <typename T> void emplace_arg(const T& arg) { | ||
| data_.emplace_back(detail::make_arg<Context>(arg)); | ||
| } | ||
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| template <typename T> | ||
| void emplace_arg(const detail::named_arg<char_type, T>& arg) { | ||
| if (named_info_.empty()) { | ||
| constexpr const detail::named_arg_info<char_type>* zero_ptr{nullptr}; | ||
| data_.insert(data_.begin(), {zero_ptr, 0}); | ||
| } | ||
| data_.emplace_back(detail::make_arg<Context>(detail::unwrap(arg.value))); | ||
| auto pop_one = [](std::vector<basic_format_arg<Context>>* data) { | ||
| data->pop_back(); | ||
| }; | ||
| std::unique_ptr<std::vector<basic_format_arg<Context>>, decltype(pop_one)> | ||
| guard{&data_, pop_one}; | ||
| named_info_.push_back({arg.name, static_cast<int>(data_.size() - 2u)}); | ||
| data_[0].value_.named_args = {named_info_.data(), named_info_.size()}; | ||
| guard.release(); | ||
| } | ||
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| public: | ||
| constexpr dynamic_format_arg_store() = default; | ||
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| /** | ||
| \rst | ||
| Adds an argument into the dynamic store for later passing to a formatting | ||
| function. | ||
| Note that custom types and string types (but not string views) are copied | ||
| into the store dynamically allocating memory if necessary. | ||
| **Example**:: | ||
| fmt::dynamic_format_arg_store<fmt::format_context> store; | ||
| store.push_back(42); | ||
| store.push_back("abc"); | ||
| store.push_back(1.5f); | ||
| std::string result = fmt::vformat("{} and {} and {}", store); | ||
| \endrst | ||
| */ | ||
| template <typename T> void push_back(const T& arg) { | ||
| if (detail::const_check(need_copy<T>::value)) | ||
| emplace_arg(dynamic_args_.push<stored_type<T>>(arg)); | ||
| else | ||
| emplace_arg(detail::unwrap(arg)); | ||
| } | ||
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| /** | ||
| \rst | ||
| Adds a reference to the argument into the dynamic store for later passing to | ||
| a formatting function. | ||
| **Example**:: | ||
| fmt::dynamic_format_arg_store<fmt::format_context> store; | ||
| char band[] = "Rolling Stones"; | ||
| store.push_back(std::cref(band)); | ||
| band[9] = 'c'; // Changing str affects the output. | ||
| std::string result = fmt::vformat("{}", store); | ||
| // result == "Rolling Scones" | ||
| \endrst | ||
| */ | ||
| template <typename T> void push_back(std::reference_wrapper<T> arg) { | ||
| static_assert( | ||
| need_copy<T>::value, | ||
| "objects of built-in types and string views are always copied"); | ||
| emplace_arg(arg.get()); | ||
| } | ||
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| /** | ||
| Adds named argument into the dynamic store for later passing to a formatting | ||
| function. ``std::reference_wrapper`` is supported to avoid copying of the | ||
| argument. The name is always copied into the store. | ||
| */ | ||
| template <typename T> | ||
| void push_back(const detail::named_arg<char_type, T>& arg) { | ||
| const char_type* arg_name = | ||
| dynamic_args_.push<std::basic_string<char_type>>(arg.name).c_str(); | ||
| if (detail::const_check(need_copy<T>::value)) { | ||
| emplace_arg( | ||
| fmt::arg(arg_name, dynamic_args_.push<stored_type<T>>(arg.value))); | ||
| } else { | ||
| emplace_arg(fmt::arg(arg_name, arg.value)); | ||
| } | ||
| } | ||
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| /** Erase all elements from the store */ | ||
| void clear() { | ||
| data_.clear(); | ||
| named_info_.clear(); | ||
| dynamic_args_ = detail::dynamic_arg_list(); | ||
| } | ||
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| /** | ||
| \rst | ||
| Reserves space to store at least *new_cap* arguments including | ||
| *new_cap_named* named arguments. | ||
| \endrst | ||
| */ | ||
| void reserve(size_t new_cap, size_t new_cap_named) { | ||
| FMT_ASSERT(new_cap >= new_cap_named, | ||
| "Set of arguments includes set of named arguments"); | ||
| data_.reserve(new_cap); | ||
| named_info_.reserve(new_cap_named); | ||
| } | ||
| }; | ||
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| FMT_END_NAMESPACE | ||
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| #endif // FMT_ARGS_H_ |
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