fmtlegacy/doc/api.rst
2015-06-10 09:32:59 +08:00

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.. _string-formatting-api:
*************
API Reference
*************
All functions and classes provided by the C++ Format library reside
in namespace ``fmt`` and macros have prefix ``FMT_``. For brevity the
namespace is usually omitted in examples.
Formatting functions
====================
The following functions use :ref:`format string syntax <syntax>` similar
to the one used by Python's `str.format
<http://docs.python.org/3/library/stdtypes.html#str.format>`_ function.
They take *format_str* and *args* as arguments.
*format_str* is a format string that contains literal text and replacement
fields surrounded by braces ``{}``. The fields are replaced with formatted
arguments in the resulting string.
*args* is an argument list representing arbitrary arguments.
.. _format:
.. doxygenfunction:: format(StringRef, ArgList)
.. _print:
.. doxygenfunction:: print(StringRef, ArgList)
.. doxygenfunction:: print(std::FILE *, StringRef, ArgList)
.. doxygenfunction:: print(std::ostream&, StringRef, ArgList)
Printf formatting functions
===========================
The following functions use `printf format string syntax
<http://pubs.opengroup.org/onlinepubs/009695399/functions/fprintf.html>`_ with
a POSIX extension for positional arguments.
.. doxygenfunction:: printf(StringRef, ArgList)
.. doxygenfunction:: fprintf(std::FILE*, StringRef, ArgList)
.. doxygenfunction:: sprintf(StringRef, ArgList)
Write API
=========
.. doxygenclass:: fmt::BasicWriter
:members:
.. doxygenclass:: fmt::BasicMemoryWriter
:members:
.. doxygenclass:: fmt::BasicArrayWriter
:members:
.. doxygenfunction:: bin
.. doxygenfunction:: oct
.. doxygenfunction:: hex
.. doxygenfunction:: hexu
.. doxygenfunction:: pad(int, unsigned, Char)
Utilities
=========
.. doxygenfunction:: fmt::arg(StringRef, const T&)
.. doxygendefine:: FMT_CAPTURE
.. doxygendefine:: FMT_VARIADIC
.. doxygenclass:: fmt::ArgList
:members:
.. doxygenclass:: fmt::BasicStringRef
:members:
.. doxygenclass:: fmt::Buffer
:protected-members:
:members:
System Errors
=============
.. doxygenclass:: fmt::SystemError
:members:
.. doxygenclass:: fmt::WindowsError
:members:
.. _formatstrings:
Custom allocators
=================
The C++ Format library supports custom dynamic memory allocators.
A custom allocator class can be specified as a template argument to
:class:`fmt::BasicMemoryWriter`::
typedef fmt::BasicMemoryWriter<char, CustomAllocator> CustomMemoryWriter;
It is also possible to write a formatting function that uses a custom
allocator::
typedef std::basic_string<char, std::char_traits<char>, CustomAllocator> CustomString;
CustomString format(CustomAllocator alloc, fmt::StringRef format_str,
fmt::ArgList args) {
CustomMemoryWriter writer(alloc);
writer.write(format_str, args);
return CustomString(writer.data(), writer.size(), alloc);
}
FMT_VARIADIC(CustomString, format, CustomAllocator, fmt::StringRef)