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114 lines
2.8 KiB
ReStructuredText
114 lines
2.8 KiB
ReStructuredText
.. cpp:namespace:: fmt
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.. _string-formatting-api:
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*************
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API Reference
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*************
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All functions and classes provided by the C++ Format library reside
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in namespace ``fmt`` and macros have prefix ``FMT_``. For brevity the
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namespace is usually omitted in examples.
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Formatting functions
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====================
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The following functions use :ref:`format string syntax <syntax>` similar
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to the one used by Python's `str.format
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<http://docs.python.org/3/library/stdtypes.html#str.format>`_ function.
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They take *format_str* and *args* as arguments.
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*format_str* is a format string that contains literal text and replacement
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fields surrounded by braces ``{}``. The fields are replaced with formatted
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arguments in the resulting string.
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*args* is an argument list representing arbitrary arguments.
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.. _format:
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.. doxygenfunction:: format(StringRef, ArgList)
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.. _print:
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.. doxygenfunction:: print(StringRef, ArgList)
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.. doxygenfunction:: print(std::FILE *, StringRef, ArgList)
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.. doxygenfunction:: print(std::ostream &, StringRef, ArgList)
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Printf formatting functions
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===========================
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The following functions use `printf format string syntax
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<http://pubs.opengroup.org/onlinepubs/009695399/functions/fprintf.html>`_ with
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a POSIX extension for positional arguments.
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.. doxygenfunction:: printf(StringRef, ArgList)
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.. doxygenfunction:: fprintf(std::FILE *, StringRef, ArgList)
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.. doxygenfunction:: sprintf(StringRef, ArgList)
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Write API
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=========
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.. doxygenclass:: fmt::BasicWriter
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:members:
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.. doxygenclass:: fmt::BasicMemoryWriter
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:members:
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.. doxygenfunction:: bin
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.. doxygenfunction:: oct
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.. doxygenfunction:: hex
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.. doxygenfunction:: hexu
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.. doxygenfunction:: pad(int, unsigned, Char)
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Utilities
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=========
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.. doxygendefine:: FMT_VARIADIC
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.. doxygenclass:: fmt::ArgList
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:members:
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.. doxygenclass:: fmt::BasicStringRef
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:members:
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System Errors
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=============
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.. doxygenclass:: fmt::SystemError
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:members:
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.. doxygenclass:: fmt::WindowsError
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:members:
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.. _formatstrings:
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Custom allocators
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=================
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The C++ Format library supports custom dynamic memory allocators.
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A custom allocator class can be specified as a template argument to
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:class:`fmt::BasicMemoryWriter`::
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typedef fmt::BasicMemoryWriter<char, CustomAllocator> CustomMemoryWriter;
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It is also possible to write a formatting function that uses a custom
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allocator::
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typedef std::basic_string<char, std::char_traits<char>, CustomAllocator> CustomString;
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CustomString format(CustomAllocator alloc, fmt::StringRef format_str,
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fmt::ArgList args) {
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CustomMemoryWriter writer(alloc);
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writer.write(format_str, args);
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return CustomString(writer.data(), writer.size(), alloc);
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}
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FMT_VARIADIC(CustomString, format, CustomAllocator, fmt::StringRef)
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