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tomlplusplus/include/toml++/impl/value.h
Mark Gillard 7b50df796f added toml::yaml_formatter 
also:
- fixed parser not correctly round-tripping int format in some cases
- added `TOML_ENABLE_FORMATTERS` option
- added `operator->` to `toml::value`
- refactoring
2021-11-03 12:18:53 +02:00

1211 lines
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//# This file is a part of toml++ and is subject to the the terms of the MIT license.
//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
// SPDX-License-Identifier: MIT
#pragma once
#include "date_time.h"
#include "node.h"
#include "print_to_stream.h"
#include "header_start.h"
TOML_DISABLE_ARITHMETIC_WARNINGS;
/// \cond
// clang-format off
#if TOML_ENABLE_WINDOWS_COMPAT
#define TOML_SA_VALUE_MESSAGE_WSTRING TOML_SA_LIST_SEP "std::wstring"
#else
#define TOML_SA_VALUE_MESSAGE_WSTRING
#endif
#if TOML_HAS_CHAR8
#define TOML_SA_VALUE_MESSAGE_U8STRING_VIEW TOML_SA_LIST_SEP "std::u8string_view"
#define TOML_SA_VALUE_MESSAGE_CONST_CHAR8 TOML_SA_LIST_SEP "const char8_t*"
#else
#define TOML_SA_VALUE_MESSAGE_U8STRING_VIEW
#define TOML_SA_VALUE_MESSAGE_CONST_CHAR8
#endif
#define TOML_SA_VALUE_EXACT_FUNC_MESSAGE(type_arg) \
"The " type_arg " must be one of:" \
TOML_SA_LIST_NEW "A native TOML value type" \
TOML_SA_NATIVE_VALUE_TYPE_LIST \
\
TOML_SA_LIST_NXT "A non-view type capable of losslessly representing a native TOML value type" \
TOML_SA_LIST_BEG "std::string" \
TOML_SA_VALUE_MESSAGE_WSTRING \
TOML_SA_LIST_SEP "any signed integer type >= 64 bits" \
TOML_SA_LIST_SEP "any floating-point type >= 64 bits" \
TOML_SA_LIST_END \
\
TOML_SA_LIST_NXT "An immutable view type not requiring additional temporary storage" \
TOML_SA_LIST_BEG "std::string_view" \
TOML_SA_VALUE_MESSAGE_U8STRING_VIEW \
TOML_SA_LIST_SEP "const char*" \
TOML_SA_VALUE_MESSAGE_CONST_CHAR8 \
TOML_SA_LIST_END
#define TOML_SA_VALUE_FUNC_MESSAGE(type_arg) \
"The " type_arg " must be one of:" \
TOML_SA_LIST_NEW "A native TOML value type" \
TOML_SA_NATIVE_VALUE_TYPE_LIST \
\
TOML_SA_LIST_NXT "A non-view type capable of losslessly representing a native TOML value type" \
TOML_SA_LIST_BEG "std::string" \
TOML_SA_VALUE_MESSAGE_WSTRING \
TOML_SA_LIST_SEP "any signed integer type >= 64 bits" \
TOML_SA_LIST_SEP "any floating-point type >= 64 bits" \
TOML_SA_LIST_END \
\
TOML_SA_LIST_NXT "A non-view type capable of (reasonably) representing a native TOML value type" \
TOML_SA_LIST_BEG "any other integer type" \
TOML_SA_LIST_SEP "any floating-point type >= 32 bits" \
TOML_SA_LIST_END \
\
TOML_SA_LIST_NXT "An immutable view type not requiring additional temporary storage" \
TOML_SA_LIST_BEG "std::string_view" \
TOML_SA_VALUE_MESSAGE_U8STRING_VIEW \
TOML_SA_LIST_SEP "const char*" \
TOML_SA_VALUE_MESSAGE_CONST_CHAR8 \
TOML_SA_LIST_END
// clang-format on
/// \endcond
/// \cond
TOML_IMPL_NAMESPACE_START
{
template <typename T, typename...>
struct native_value_maker
{
template <typename... Args>
TOML_NODISCARD
static T make(Args&&... args) noexcept(std::is_nothrow_constructible_v<T, Args&&...>)
{
return T(static_cast<Args&&>(args)...);
}
};
template <typename T>
struct native_value_maker<T, T>
{
template <typename U>
TOML_NODISCARD
TOML_ALWAYS_INLINE
static U&& make(U&& val) noexcept
{
return static_cast<U&&>(val);
}
};
#if TOML_HAS_CHAR8 || TOML_ENABLE_WINDOWS_COMPAT
struct string_maker
{
template <typename T>
TOML_NODISCARD
static std::string make(T&& arg) noexcept
{
#if TOML_HAS_CHAR8
if constexpr (is_one_of<std::decay_t<T>, char8_t*, const char8_t*>)
return std::string(reinterpret_cast<const char*>(static_cast<const char8_t*>(arg)));
else if constexpr (is_one_of<remove_cvref<T>, std::u8string, std::u8string_view>)
return std::string(reinterpret_cast<const char*>(static_cast<const char8_t*>(arg.data())),
arg.length());
#endif // TOML_HAS_CHAR8
#if TOML_ENABLE_WINDOWS_COMPAT
if constexpr (is_wide_string<T>)
return narrow(static_cast<T&&>(arg));
#endif // TOML_ENABLE_WINDOWS_COMPAT
}
};
#if TOML_HAS_CHAR8
template <>
struct native_value_maker<std::string, char8_t*> : string_maker
{};
template <>
struct native_value_maker<std::string, const char8_t*> : string_maker
{};
template <>
struct native_value_maker<std::string, std::u8string> : string_maker
{};
template <>
struct native_value_maker<std::string, std::u8string_view> : string_maker
{};
#endif // TOML_HAS_CHAR8
#if TOML_ENABLE_WINDOWS_COMPAT
template <>
struct native_value_maker<std::string, wchar_t*> : string_maker
{};
template <>
struct native_value_maker<std::string, const wchar_t*> : string_maker
{};
template <>
struct native_value_maker<std::string, std::wstring> : string_maker
{};
template <>
struct native_value_maker<std::string, std::wstring_view> : string_maker
{};
#endif // TOML_ENABLE_WINDOWS_COMPAT
#endif // TOML_HAS_CHAR8 || TOML_ENABLE_WINDOWS_COMPAT
template <typename T>
TOML_CONST_GETTER
inline optional<T> node_integer_cast(int64_t val) noexcept
{
static_assert(node_type_of<T> == node_type::integer);
static_assert(!is_cvref<T>);
using traits = value_traits<T>;
if constexpr (!traits::is_signed)
{
if constexpr ((sizeof(T) * CHAR_BIT) < 63) // 63 bits == int64_max
{
using common_t = decltype(int64_t{} + T{});
if (val < int64_t{} || static_cast<common_t>(val) > static_cast<common_t>(traits::max))
return {};
}
else
{
if (val < int64_t{})
return {};
}
}
else
{
if (val < traits::min || val > traits::max)
return {};
}
return { static_cast<T>(val) };
}
}
TOML_IMPL_NAMESPACE_END;
/// \endcond
TOML_NAMESPACE_START
{
/// \brief A TOML value.
///
/// \tparam ValueType The value's native TOML data type. Can be one of:
/// - std::string
/// - toml::date
/// - toml::time
/// - toml::date_time
/// - int64_t
/// - double
/// - bool
template <typename ValueType>
class value : public node
{
static_assert(impl::is_native<ValueType> && !impl::is_cvref<ValueType>,
"A toml::value<> must model one of the native TOML value types:" TOML_SA_NATIVE_VALUE_TYPE_LIST);
private:
/// \cond
friend class TOML_PARSER_TYPENAME;
template <typename T, typename U>
TOML_CONST_INLINE_GETTER
static auto as_value([[maybe_unused]] U* ptr) noexcept
{
if constexpr (std::is_same_v<value_type, T>)
return ptr;
else
return nullptr;
}
ValueType val_;
value_flags flags_ = value_flags::none;
/// \endcond
public:
/// \brief The value's underlying data type.
using value_type = ValueType;
/// \brief A type alias for 'value arguments'.
/// \details This differs according to the value's type argument:
/// - ints, floats, booleans: `value_type`
/// - strings: `string_view`
/// - everything else: `const value_type&`
using value_arg = POXY_IMPLEMENTATION_DETAIL(
std::conditional_t<
std::is_same_v<value_type, std::string>,
std::string_view,
std::conditional_t<impl::is_one_of<value_type, double, int64_t, bool>, value_type, const value_type&>>);
/// \brief Constructs a toml value.
///
/// \tparam Args Constructor argument types.
/// \param args Arguments to forward to the internal value's constructor.
template <typename... Args>
TOML_NODISCARD_CTOR
explicit value(Args&&... args) noexcept(noexcept(value_type(
impl::native_value_maker<value_type, std::decay_t<Args>...>::make(static_cast<Args&&>(args)...))))
: val_(impl::native_value_maker<value_type, std::decay_t<Args>...>::make(static_cast<Args&&>(args)...))
{
#if TOML_LIFETIME_HOOKS
TOML_VALUE_CREATED;
#endif
}
/// \brief Copy constructor.
TOML_NODISCARD_CTOR
value(const value& other) noexcept //
: node(other),
val_{ other.val_ },
flags_{ other.flags_ }
{
#if TOML_LIFETIME_HOOKS
TOML_VALUE_CREATED;
#endif
}
/// \brief Move constructor.
TOML_NODISCARD_CTOR
value(value&& other) noexcept //
: node(std::move(other)),
val_{ std::move(other.val_) },
flags_{ other.flags_ }
{
#if TOML_LIFETIME_HOOKS
TOML_VALUE_CREATED;
#endif
}
/// \brief Copy-assignment operator.
value& operator=(const value& rhs) noexcept
{
node::operator=(rhs);
val_ = rhs.val_;
flags_ = rhs.flags_;
return *this;
}
/// \brief Move-assignment operator.
value& operator=(value&& rhs) noexcept
{
if (&rhs != this)
{
node::operator=(std::move(rhs));
val_ = std::move(rhs.val_);
flags_ = rhs.flags_;
}
return *this;
}
#if TOML_LIFETIME_HOOKS
~value() noexcept
{
TOML_VALUE_DESTROYED;
}
#endif
/// \name Type checks
/// @{
/// \brief Returns the value's node type identifier.
///
/// \returns One of:
/// - node_type::string
/// - node_type::integer
/// - node_type::floating_point
/// - node_type::boolean
/// - node_type::date
/// - node_type::time
/// - node_type::date_time
TOML_CONST_INLINE_GETTER
node_type type() const noexcept final
{
return impl::node_type_of<value_type>;
}
TOML_PURE_GETTER
bool is_homogeneous(node_type ntype) const noexcept final
{
return ntype == node_type::none || ntype == impl::node_type_of<value_type>;
}
TOML_PURE_GETTER
bool is_homogeneous(node_type ntype, node*& first_nonmatch) noexcept final
{
if (ntype != node_type::none && ntype != impl::node_type_of<value_type>)
{
first_nonmatch = this;
return false;
}
return true;
}
TOML_PURE_GETTER
bool is_homogeneous(node_type ntype, const node*& first_nonmatch) const noexcept final
{
if (ntype != node_type::none && ntype != impl::node_type_of<value_type>)
{
first_nonmatch = this;
return false;
}
return true;
}
/// \cond
template <typename ElemType = void>
TOML_PURE_GETTER
bool is_homogeneous() const noexcept
{
using type = impl::unwrap_node<ElemType>;
static_assert(
std::is_void_v<
type> || ((impl::is_native<type> || impl::is_one_of<type, table, array>)&&!impl::is_cvref<type>),
"The template type argument of value::is_homogeneous() must be void or one "
"of:" TOML_SA_UNWRAPPED_NODE_TYPE_LIST);
using type = impl::unwrap_node<ElemType>;
if constexpr (std::is_void_v<type>)
return true;
else
return impl::node_type_of<type> == impl::node_type_of<value_type>;
}
/// \endcond
/// \brief Returns `false`.
TOML_CONST_INLINE_GETTER
bool is_table() const noexcept final
{
return false;
}
/// \brief Returns `false`.
TOML_CONST_INLINE_GETTER
bool is_array() const noexcept final
{
return false;
}
/// \brief Returns `false`.
TOML_CONST_INLINE_GETTER
bool is_array_of_tables() const noexcept final
{
return false;
}
/// \brief Returns `true`.
TOML_CONST_INLINE_GETTER
bool is_value() const noexcept final
{
return true;
}
/// \brief Returns `true` if the #value_type is std::string.
TOML_CONST_INLINE_GETTER
bool is_string() const noexcept final
{
return std::is_same_v<value_type, std::string>;
}
/// \brief Returns `true` if the #value_type is int64_t.
TOML_CONST_INLINE_GETTER
bool is_integer() const noexcept final
{
return std::is_same_v<value_type, int64_t>;
}
/// \brief Returns `true` if the #value_type is `double`.
TOML_CONST_INLINE_GETTER
bool is_floating_point() const noexcept final
{
return std::is_same_v<value_type, double>;
}
/// \brief Returns `true` if the #value_type is int64_t or `double`.
TOML_CONST_INLINE_GETTER
bool is_number() const noexcept final
{
return impl::is_one_of<value_type, int64_t, double>;
}
/// \brief Returns `true` if the #value_type is `bool`.
TOML_CONST_INLINE_GETTER
bool is_boolean() const noexcept final
{
return std::is_same_v<value_type, bool>;
}
/// \brief Returns `true` if the #value_type is toml::date.
TOML_CONST_INLINE_GETTER
bool is_date() const noexcept final
{
return std::is_same_v<value_type, date>;
}
/// \brief Returns `true` if the #value_type is toml::time.
TOML_CONST_INLINE_GETTER
bool is_time() const noexcept final
{
return std::is_same_v<value_type, time>;
}
/// \brief Returns `true` if the #value_type is toml_date_time.
TOML_CONST_INLINE_GETTER
bool is_date_time() const noexcept final
{
return std::is_same_v<value_type, date_time>;
}
/// @}
/// \name Type casts
/// @{
/// \brief Returns `nullptr`.
TOML_CONST_INLINE_GETTER
table* as_table() noexcept final
{
return nullptr;
}
/// \brief Returns `nullptr`.
TOML_CONST_INLINE_GETTER
array* as_array() noexcept final
{
return nullptr;
}
/// \brief Returns a pointer to the value if it is a value<std::string>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
value<std::string>* as_string() noexcept final
{
return as_value<std::string>(this);
}
/// \brief Returns a pointer to the value if it is a value<int64_t>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
value<int64_t>* as_integer() noexcept final
{
return as_value<int64_t>(this);
}
/// \brief Returns a pointer to the value if it is a value<double>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
value<double>* as_floating_point() noexcept final
{
return as_value<double>(this);
}
/// \brief Returns a pointer to the value if it is a value<bool>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
value<bool>* as_boolean() noexcept final
{
return as_value<bool>(this);
}
/// \brief Returns a pointer to the value if it is a value<date>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
value<date>* as_date() noexcept final
{
return as_value<date>(this);
}
/// \brief Returns a pointer to the value if it is a value<time>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
value<time>* as_time() noexcept final
{
return as_value<time>(this);
}
/// \brief Returns a pointer to the value if it is a value<date_time>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
value<date_time>* as_date_time() noexcept final
{
return as_value<date_time>(this);
}
/// \brief Returns `nullptr`.
TOML_CONST_INLINE_GETTER
const table* as_table() const noexcept final
{
return nullptr;
}
/// \brief Returns `nullptr`.
TOML_CONST_INLINE_GETTER
const array* as_array() const noexcept final
{
return nullptr;
}
/// \brief Returns a const-qualified pointer to the value if it is a value<std::string>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
const value<std::string>* as_string() const noexcept final
{
return as_value<std::string>(this);
}
/// \brief Returns a const-qualified pointer to the value if it is a value<int64_t>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
const value<int64_t>* as_integer() const noexcept final
{
return as_value<int64_t>(this);
}
/// \brief Returns a const-qualified pointer to the value if it is a value<double>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
const value<double>* as_floating_point() const noexcept final
{
return as_value<double>(this);
}
/// \brief Returns a const-qualified pointer to the value if it is a value<bool>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
const value<bool>* as_boolean() const noexcept final
{
return as_value<bool>(this);
}
/// \brief Returns a const-qualified pointer to the value if it is a value<date>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
const value<date>* as_date() const noexcept final
{
return as_value<date>(this);
}
/// \brief Returns a const-qualified pointer to the value if it is a value<time>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
const value<time>* as_time() const noexcept final
{
return as_value<time>(this);
}
/// \brief Returns a const-qualified pointer to the value if it is a value<date_time>, otherwise `nullptr`.
TOML_CONST_INLINE_GETTER
const value<date_time>* as_date_time() const noexcept final
{
return as_value<date_time>(this);
}
/// @}
/// \name Value retrieval
/// @{
/// \brief Returns a reference to the underlying value.
TOML_PURE_INLINE_GETTER
value_type& get() & noexcept
{
return val_;
}
/// \brief Returns a reference to the underlying value (rvalue overload).
TOML_PURE_INLINE_GETTER
value_type&& get() && noexcept
{
return static_cast<value_type&&>(val_);
}
/// \brief Returns a reference to the underlying value (const overload).
TOML_PURE_INLINE_GETTER
const value_type& get() const& noexcept
{
return val_;
}
/// \brief Returns a reference to the underlying value.
TOML_PURE_INLINE_GETTER
value_type& operator*() & noexcept
{
return val_;
}
/// \brief Returns a reference to the underlying value (rvalue overload).
TOML_PURE_INLINE_GETTER
value_type&& operator*() && noexcept
{
return static_cast<value_type&&>(val_);
}
/// \brief Returns a reference to the underlying value (const overload).
TOML_PURE_INLINE_GETTER
const value_type& operator*() const& noexcept
{
return val_;
}
/// \brief Returns a reference to the underlying value.
TOML_PURE_INLINE_GETTER
explicit operator value_type&() & noexcept
{
return val_;
}
/// \brief Returns a reference to the underlying value (rvalue overload).
TOML_PURE_INLINE_GETTER
explicit operator value_type&&() && noexcept
{
return static_cast<value_type&&>(val_);
}
/// \brief Returns a reference to the underlying value (const overload).
TOML_PURE_INLINE_GETTER
explicit operator const value_type&() const& noexcept
{
return val_;
}
/// \brief Returns a pointer to the underlying value.
///
/// \availability This operator is only available when #value_type is a class/struct.
TOML_HIDDEN_CONSTRAINT(std::is_class_v<T>, typename T = value_type)
TOML_PURE_INLINE_GETTER
value_type* operator->() noexcept
{
return &val_;
}
/// \brief Returns a pointer to the underlying value (const overload).
///
/// \availability This operator is only available when #value_type is a class/struct.
TOML_HIDDEN_CONSTRAINT(std::is_class_v<T>, typename T = value_type)
TOML_PURE_INLINE_GETTER
const value_type* operator->() const noexcept
{
return &val_;
}
/// @}
/// \name Metadata
/// @{
/// \brief Returns the metadata flags associated with this value.
TOML_NODISCARD
value_flags flags() const noexcept
{
return flags_;
}
/// \brief Sets the metadata flags associated with this value.
/// \returns A reference to the value object.
value& flags(value_flags new_flags) noexcept
{
flags_ = new_flags;
return *this;
}
/// @}
/// \brief Value-assignment operator.
value& operator=(value_arg rhs) noexcept
{
if constexpr (std::is_same_v<value_type, std::string>)
val_.assign(rhs);
else
val_ = rhs;
return *this;
}
TOML_CONSTRAINED_TEMPLATE((std::is_same_v<T, std::string>), typename T = value_type)
value& operator=(std::string&& rhs) noexcept
{
val_ = std::move(rhs);
return *this;
}
/// \name Equality
/// @{
/// \brief Value equality operator.
TOML_NODISCARD
friend bool operator==(const value& lhs, value_arg rhs) noexcept
{
if constexpr (std::is_same_v<value_type, double>)
{
const auto lhs_class = impl::fpclassify(lhs.val_);
const auto rhs_class = impl::fpclassify(rhs);
if (lhs_class == impl::fp_class::nan && rhs_class == impl::fp_class::nan)
return true;
if ((lhs_class == impl::fp_class::nan) != (rhs_class == impl::fp_class::nan))
return false;
}
return lhs.val_ == rhs;
}
TOML_ASYMMETRICAL_EQUALITY_OPS(const value&, value_arg, );
/// \brief Value less-than operator.
TOML_NODISCARD
friend bool operator<(const value& lhs, value_arg rhs) noexcept
{
return lhs.val_ < rhs;
}
/// \brief Value less-than operator.
TOML_NODISCARD
friend bool operator<(value_arg lhs, const value& rhs) noexcept
{
return lhs < rhs.val_;
}
/// \brief Value less-than-or-equal-to operator.
TOML_NODISCARD
friend bool operator<=(const value& lhs, value_arg rhs) noexcept
{
return lhs.val_ <= rhs;
}
/// \brief Value less-than-or-equal-to operator.
TOML_NODISCARD
friend bool operator<=(value_arg lhs, const value& rhs) noexcept
{
return lhs <= rhs.val_;
}
/// \brief Value greater-than operator.
TOML_NODISCARD
friend bool operator>(const value& lhs, value_arg rhs) noexcept
{
return lhs.val_ > rhs;
}
/// \brief Value greater-than operator.
TOML_NODISCARD
friend bool operator>(value_arg lhs, const value& rhs) noexcept
{
return lhs > rhs.val_;
}
/// \brief Value greater-than-or-equal-to operator.
TOML_NODISCARD
friend bool operator>=(const value& lhs, value_arg rhs) noexcept
{
return lhs.val_ >= rhs;
}
/// \brief Value greater-than-or-equal-to operator.
TOML_NODISCARD
friend bool operator>=(value_arg lhs, const value& rhs) noexcept
{
return lhs >= rhs.val_;
}
/// \brief Equality operator.
///
/// \param lhs The LHS value.
/// \param rhs The RHS value.
///
/// \returns True if the values were of the same type and contained the same value.
template <typename T>
TOML_NODISCARD
friend bool operator==(const value& lhs, const value<T>& rhs) noexcept
{
if constexpr (std::is_same_v<value_type, T>)
return lhs == rhs.val_; // calls asymmetrical value-equality operator defined above
else
return false;
}
/// \brief Inequality operator.
///
/// \param lhs The LHS value.
/// \param rhs The RHS value.
///
/// \returns True if the values were not of the same type, or did not contain the same value.
template <typename T>
TOML_NODISCARD
friend bool operator!=(const value& lhs, const value<T>& rhs) noexcept
{
return !(lhs == rhs);
}
/// \brief Less-than operator.
///
/// \param lhs The LHS toml::value.
/// \param rhs The RHS toml::value.
///
/// \returns \conditional_return{Same value types}
/// `lhs.get() < rhs.get()`
/// \conditional_return{Different value types}
/// `lhs.type() < rhs.type()`
template <typename T>
TOML_NODISCARD
friend bool operator<(const value& lhs, const value<T>& rhs) noexcept
{
if constexpr (std::is_same_v<value_type, T>)
return lhs.val_ < rhs.val_;
else
return impl::node_type_of<value_type> < impl::node_type_of<T>;
}
/// \brief Less-than-or-equal-to operator.
///
/// \param lhs The LHS toml::value.
/// \param rhs The RHS toml::value.
///
/// \returns \conditional_return{Same value types}
/// `lhs.get() <= rhs.get()`
/// \conditional_return{Different value types}
/// `lhs.type() <= rhs.type()`
template <typename T>
TOML_NODISCARD
friend bool operator<=(const value& lhs, const value<T>& rhs) noexcept
{
if constexpr (std::is_same_v<value_type, T>)
return lhs.val_ <= rhs.val_;
else
return impl::node_type_of<value_type> <= impl::node_type_of<T>;
}
/// \brief Greater-than operator.
///
/// \param lhs The LHS toml::value.
/// \param rhs The RHS toml::value.
///
/// \returns \conditional_return{Same value types}
/// `lhs.get() > rhs.get()`
/// \conditional_return{Different value types}
/// `lhs.type() > rhs.type()`
template <typename T>
TOML_NODISCARD
friend bool operator>(const value& lhs, const value<T>& rhs) noexcept
{
if constexpr (std::is_same_v<value_type, T>)
return lhs.val_ > rhs.val_;
else
return impl::node_type_of<value_type> > impl::node_type_of<T>;
}
/// \brief Greater-than-or-equal-to operator.
///
/// \param lhs The LHS toml::value.
/// \param rhs The RHS toml::value.
///
/// \returns \conditional_return{Same value types}
/// `lhs.get() >= rhs.get()`
/// \conditional_return{Different value types}
/// `lhs.type() >= rhs.type()`
template <typename T>
TOML_NODISCARD
friend bool operator>=(const value& lhs, const value<T>& rhs) noexcept
{
if constexpr (std::is_same_v<value_type, T>)
return lhs.val_ >= rhs.val_;
else
return impl::node_type_of<value_type> >= impl::node_type_of<T>;
}
/// @}
#if TOML_ENABLE_FORMATTERS
/// \brief Prints the value out to a stream as formatted TOML.
///
/// \availability This operator is only available when #TOML_ENABLE_FORMATTERS is enabled.
friend std::ostream& operator<<(std::ostream& lhs, const value& rhs)
{
impl::print_to_stream(lhs, rhs);
return lhs;
}
#endif
};
/// \cond
template <typename T>
value(T) -> value<impl::native_type_of<impl::remove_cvref<T>>>;
template <typename T>
TOML_NODISCARD
inline decltype(auto) node::get_value_exact() const noexcept(impl::value_retrieval_is_nothrow<T>)
{
using namespace impl;
static_assert(node_type_of<T> != node_type::none);
static_assert(node_type_of<T> != node_type::table);
static_assert(node_type_of<T> != node_type::array);
static_assert(is_native<T> || can_represent_native<T>);
static_assert(!is_cvref<T>);
TOML_ASSERT(this->type() == node_type_of<T>);
if constexpr (node_type_of<T> == node_type::string)
{
const auto& str = *ref_cast<std::string>();
if constexpr (std::is_same_v<T, std::string>)
return str;
else if constexpr (std::is_same_v<T, std::string_view>)
return T{ str };
else if constexpr (std::is_same_v<T, const char*>)
return str.c_str();
else if constexpr (std::is_same_v<T, std::wstring>)
{
#if TOML_ENABLE_WINDOWS_COMPAT
return widen(str);
#else
static_assert(dependent_false<T>, "Evaluated unreachable branch!");
#endif
}
#if TOML_HAS_CHAR8
// char -> char8_t (potentially unsafe - the feature is 'experimental'!)
else if constexpr (is_one_of<T, std::u8string, std::u8string_view>)
return T(reinterpret_cast<const char8_t*>(str.c_str()), str.length());
else if constexpr (std::is_same_v<T, const char8_t*>)
return reinterpret_cast<const char8_t*>(str.c_str());
else
static_assert(dependent_false<T>, "Evaluated unreachable branch!");
#endif
}
else
return static_cast<T>(*ref_cast<native_type_of<T>>());
}
template <typename T>
TOML_NODISCARD
inline optional<T> node::value_exact() const noexcept(impl::value_retrieval_is_nothrow<T>)
{
using namespace impl;
static_assert(!is_wide_string<T> || TOML_ENABLE_WINDOWS_COMPAT,
"Retrieving values as wide-character strings with node::value_exact() is only "
"supported on Windows with TOML_ENABLE_WINDOWS_COMPAT enabled.");
static_assert((is_native<T> || can_represent_native<T>)&&!is_cvref<T>,
TOML_SA_VALUE_EXACT_FUNC_MESSAGE("return type of node::value_exact()"));
// prevent additional compiler error spam when the static_assert fails by gating behind if constexpr
if constexpr ((is_native<T> || can_represent_native<T>)&&!is_cvref<T>)
{
if (type() == node_type_of<T>)
return { this->get_value_exact<T>() };
else
return {};
}
}
template <typename T>
TOML_NODISCARD
inline optional<T> node::value() const noexcept(impl::value_retrieval_is_nothrow<T>)
{
using namespace impl;
static_assert(!is_wide_string<T> || TOML_ENABLE_WINDOWS_COMPAT,
"Retrieving values as wide-character strings with node::value() is only "
"supported on Windows with TOML_ENABLE_WINDOWS_COMPAT enabled.");
static_assert((is_native<T> || can_represent_native<T> || can_partially_represent_native<T>)&&!is_cvref<T>,
TOML_SA_VALUE_FUNC_MESSAGE("return type of node::value()"));
// when asking for strings, dates, times and date_times there's no 'fuzzy' conversion
// semantics to be mindful of so the exact retrieval is enough.
if constexpr (is_natively_one_of<T, std::string, time, date, date_time>)
{
if (type() == node_type_of<T>)
return { this->get_value_exact<T>() };
else
return {};
}
// everything else requires a bit of logicking.
else
{
switch (type())
{
// int -> *
case node_type::integer:
{
// int -> int
if constexpr (is_natively_one_of<T, int64_t>)
{
if constexpr (is_native<T> || can_represent_native<T>)
return static_cast<T>(*ref_cast<int64_t>());
else
return node_integer_cast<T>(*ref_cast<int64_t>());
}
// int -> float
else if constexpr (is_natively_one_of<T, double>)
{
const int64_t val = *ref_cast<int64_t>();
if constexpr (std::numeric_limits<T>::digits < 64)
{
constexpr auto largest_whole_float = (int64_t{ 1 } << std::numeric_limits<T>::digits);
if (val < -largest_whole_float || val > largest_whole_float)
return {};
}
return static_cast<T>(val);
}
// int -> bool
else if constexpr (is_natively_one_of<T, bool>)
return static_cast<bool>(*ref_cast<int64_t>());
// int -> anything else
else
return {};
}
// float -> *
case node_type::floating_point:
{
// float -> float
if constexpr (is_natively_one_of<T, double>)
{
if constexpr (is_native<T> || can_represent_native<T>)
return { static_cast<T>(*ref_cast<double>()) };
else
{
const double val = *ref_cast<double>();
if (impl::fpclassify(val) == fp_class::ok
&& (val < (std::numeric_limits<T>::lowest)() || val > (std::numeric_limits<T>::max)()))
return {};
return { static_cast<T>(val) };
}
}
// float -> int
else if constexpr (is_natively_one_of<T, int64_t>)
{
const double val = *ref_cast<double>();
if (impl::fpclassify(val) == fp_class::ok
&& static_cast<double>(static_cast<int64_t>(val)) == val)
return node_integer_cast<T>(static_cast<int64_t>(val));
else
return {};
}
// float -> anything else
else
return {};
}
// bool -> *
case node_type::boolean:
{
// bool -> bool
if constexpr (is_natively_one_of<T, bool>)
return { *ref_cast<bool>() };
// bool -> int
else if constexpr (is_natively_one_of<T, int64_t>)
return { static_cast<T>(*ref_cast<bool>()) };
// bool -> anything else
else
return {};
}
}
// non-values, or 'exact' types covered above
return {};
}
}
template <typename T>
TOML_NODISCARD
inline auto node::value_or(T && default_value) const noexcept(impl::value_retrieval_is_nothrow<T>)
{
using namespace impl;
static_assert(!is_wide_string<T> || TOML_ENABLE_WINDOWS_COMPAT,
"Retrieving values as wide-character strings with node::value_or() is only "
"supported on Windows with TOML_ENABLE_WINDOWS_COMPAT enabled.");
if constexpr (is_wide_string<T>)
{
#if TOML_ENABLE_WINDOWS_COMPAT
if (type() == node_type::string)
return widen(*ref_cast<std::string>());
return std::wstring{ static_cast<T&&>(default_value) };
#else
static_assert(dependent_false<T>, "Evaluated unreachable branch!");
#endif
}
else
{
using value_type =
std::conditional_t<std::is_pointer_v<std::decay_t<T>>,
std::add_pointer_t<std::add_const_t<std::remove_pointer_t<std::decay_t<T>>>>,
std::decay_t<T>>;
using traits = value_traits<value_type>;
// clang-format off
static_assert(
traits::is_native || traits::can_represent_native || traits::can_partially_represent_native,
"The default value type of node::value_or() must be one of:"
TOML_SA_LIST_NEW "A native TOML value type"
TOML_SA_NATIVE_VALUE_TYPE_LIST
TOML_SA_LIST_NXT "A non-view type capable of losslessly representing a native TOML value type"
TOML_SA_LIST_BEG "std::string"
#if TOML_ENABLE_WINDOWS_COMPAT
TOML_SA_LIST_SEP "std::wstring"
#endif
TOML_SA_LIST_SEP "any signed integer type >= 64 bits"
TOML_SA_LIST_SEP "any floating-point type >= 64 bits"
TOML_SA_LIST_END
TOML_SA_LIST_NXT "A non-view type capable of (reasonably) representing a native TOML value type"
TOML_SA_LIST_BEG "any other integer type"
TOML_SA_LIST_SEP "any floating-point type >= 32 bits"
TOML_SA_LIST_END
TOML_SA_LIST_NXT "A compatible view type"
TOML_SA_LIST_BEG "std::string_view"
#if TOML_HAS_CHAR8
TOML_SA_LIST_SEP "std::u8string_view"
#endif
#if TOML_ENABLE_WINDOWS_COMPAT
TOML_SA_LIST_SEP "std::wstring_view"
#endif
TOML_SA_LIST_SEP "const char*"
#if TOML_HAS_CHAR8
TOML_SA_LIST_SEP "const char8_t*"
#endif
#if TOML_ENABLE_WINDOWS_COMPAT
TOML_SA_LIST_SEP "const wchar_t*"
#endif
TOML_SA_LIST_END
);
// clang-format on
// prevent additional compiler error spam when the static_assert fails by gating behind if constexpr
if constexpr (traits::is_native || traits::can_represent_native || traits::can_partially_represent_native)
{
if constexpr (traits::is_native)
{
if (type() == node_type_of<value_type>)
return *ref_cast<typename traits::native_type>();
}
if (auto val = this->value<value_type>())
return *val;
if constexpr (std::is_pointer_v<value_type>)
return value_type{ default_value };
else
return static_cast<T&&>(default_value);
}
}
}
/// \endcond
}
TOML_NAMESPACE_END;
/// \cond
#if TOML_EXTERN_TEMPLATES && !TOML_IMPLEMENTATION
#include "value_extern.inl"
#endif
/// \endcond
#include "header_end.h"
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