Update README.rst
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README.rst
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README.rst
@ -106,9 +106,7 @@ An object of any user-defined type for which there is an overloaded
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std::string s = fmt::format("The date is {}", Date(2012, 12, 9));
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// s == "The date is 2012-12-9"
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You can use the `FMT_VARIADIC
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<http://fmtlib.net/latest/api.html#utilities>`_
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macro to create your own functions similar to `format
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You can create your own functions similar to `format
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<http://fmtlib.net/latest/api.html#format>`_ and
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`print <http://fmtlib.net/latest/api.html#print>`_
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which take arbitrary arguments:
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@ -116,17 +114,19 @@ which take arbitrary arguments:
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.. code:: c++
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// Prints formatted error message.
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void report_error(const char *format, fmt::ArgList args) {
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void vreport_error(const char *format, fmt::args args) {
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fmt::print("Error: ");
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fmt::print(format, args);
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fmt::vprint(format, args);
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}
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template <typename... Args>
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void report_error(const char *format, const Args & ... args) {
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vreport_error(format, fmt::make_args(args));
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}
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FMT_VARIADIC(void, report_error, const char *)
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report_error("file not found: {}", path);
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Note that you only need to define one function that takes ``fmt::ArgList``
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argument. ``FMT_VARIADIC`` automatically defines necessary wrappers that
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accept variable number of arguments.
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Note that ``vreport_error`` is not parameterized on argument types which can
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improve compile times and reduce code size compared to fully parameterized version.
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Projects using this library
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---------------------------
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