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| title |
|---|
| string_stream |
{{< callout type="info">}}
Header: string_stream.h
{{< /callout >}}
Streaming types
string_stream
wstring_stream
u16string_stream
u32string_stream
Classes to build strings using a streaming API.
Uses etl::basic_format_spec to define the required formatting.
The documentation below is for etl::string_stream.
The other streams have a similar API, though using w, u8, u16 or u32 types.
Member functions
explicit string_stream(etl::istring& str)
Description
Construct, using the supplied string as a buffer.
Uses the default format_spec.
string_stream(etl::istring& str, const etl::format_spec& spec)
Description
Construct, using the supplied string as a buffer.
Initialised with the supplied format_spec.
void set_format(const etl::format_spec& spec_)
Description
Sets a new format_spec to use.
const etl::format_spec& get_format() const
Description
Gets the current format_spec.
etl::istring& str()
Description
Gets a reference to the internal string.
const etl::istring& str() const
Description
Gets a const reference to the internal string.
void str(const etl::istring::const_pointer p)
Description
Resets the internal string to the text pointed to by p.
void str(const etl::istring& text)
Description
Resets the internal string to text.
Streaming operators
string_stream& operator <<(string_stream& ss, T value)
Description
Where T may be one of the following:-
Any fundamental type.
etl::format_spec
etl::setb0ase(n)
etl::bin
etl::oct
etl::dec
etl::hex
etl::setfill(c)
etl::setw(n)
etl::setprecision(n)
etl::left
etl::right
etl::boolalpha
etl::noboolalpha
etl::uppercase
etl::nouppercase
etl::showbase
etl::noshowbase
etl::string
etl::istring
etl::string_view
const char*
See etl::format_spec
Custom user types may be streamed by overloading the streaming operator.
Examples
Using format_spec
etl::format_spec format1 = etl::format_spec().hex().width(8).fill('0');
etl::format_spec format2;
etl::format_spec format3 = etl::format_spec().width(6).fill('#').precision(3);
etl::string<50> text;
etl::string_stream stream(text);
stream << format1 << 1193046 << format2 << " " << format3 << 3.1415;
const etl::istring& result = stream.str();
text is set to "00123456 #3.142".
Using stream manipulators
etl::string<50> text;
etl::string_stream stream(text);
stream << etl::hex << etl::setw(8) << etl::setfill('0') << 1193046
<< etl::setw(0) << " "
<< etl::setw(6) << etl::setfill('#') << etl::setprecision(3) << 3.1415;
const etl::istring& result = stream.str();
text is set to "00123456 #3.142".