segments::const

segments::const_reference

A type which can represent a segment as a reference.

Synopsis

using const_reference = decode_view;

Types

Name	Description
const_iterator	An iterator of constant, decoded characters.
const_reference	The reference type.
difference_type	The signed integer type.
iterator	An iterator of constant, decoded characters.
reference	The reference type.
size_type	The unsigned integer type.
value_type	The value type.

Member Functions

Name	Description
append_to	Append the range with percent-decoded applied to an existing string.
assign_to	Assign the range with percent-decoded applied to an existing string.
back	Return the last character.
begin	Return an iterator to the beginning.
compare	Return the result of comparing to another string.
copy	Copy a decoded substring to another character string.
decode_view	Constructor.
empty	Return true if the string is empty.
encoded	Return the encoded string.
end	Return an iterator to the end.
front	Return the first character.
operator std::string	Return a std::string with percent-decoding applied.
options	Return the decoding options.
size	Return the number of decoded characters.
to_string	Return a std::string with percent-decoding applied.

Friends

Name	Description
operator==	Return the result of comparing s0 and s1.
operator!=	Return the result of comparing s0 and s1.
operator<	Return the result of comparing s0 and s1.
operator<=	Return the result of comparing s0 and s1.
operator>	Return the result of comparing s0 and s1.
operator>=	Return the result of comparing s0 and s1.
operator<<	Format the string with percent-decoding applied to the output stream.

These views reference strings in parts of URLs or other components that are percent-encoded. The special characters (those not in the allowed character set) are stored as three character escapes that consist of a percent sign ('%') followed by a two-digit hexadecimal number of the corresponding unescaped character code, which may be part of a UTF-8 code point depending on the context. The view refers to the original character buffer and only decodes escaped sequences when needed. In particular these operations perform percent-decoding automatically without the need to allocate memory:

Iteration of the string
Accessing the encoded character buffer
Comparison to encoded or plain strings

However, in order to access the string as a as a contiguous character buffer with with percent-decoding applied, the caller must explicitly opt-in to an operation that is potentially allocating. These operations are:

Conversion to std::string
Appending to an existing character buffer
Assigning to an existing character buffer

These objects can only be constructed from strings that have a valid percent-encoding, otherwise construction fails. The caller is responsible for ensuring that the lifetime of the character buffer from which the view is constructed extends unmodified until the view is no longer accessed.

Description

This type does not make a copy of a segment and ownership is retained by the container.