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Update README.rst

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Victor Zverovich 2018-03-09 15:44:46 -08:00 committed by GitHub
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@ -84,22 +84,22 @@ Format strings can be checked at compile time:
.. code:: c++
// test.cc
using namespace fmt::literals;
std::string s = "{2}"_format(42);
#include <fmt/format.h>
std::string s = fmt::format(fmt("{2}"), 42);
.. code::
$ g++ -Iinclude test.cc -std=c++14
...
test.cc:5:31: note: in instantiation of function template specialization
'fmt::internal::udl_formatter<char, '{', '2', '}'>::operator()<int>' requested
here
std::string s = "{2}"_format(42);
^
include/fmt/format.h:3838:7: note: non-constexpr function 'on_error' cannot be
used in a constant expression
on_error("argument index out of range");
^
test.cc:2:22: note: in instantiation of function template specialization 'fmt::format<S, int>' requested here
std::string s = fmt::format(fmt("{2}"), 42);
^
include/fmt/core.h:749:19: note: non-constexpr function 'on_error' cannot be used in a constant expression
ErrorHandler::on_error(message);
^
include/fmt/format.h:2081:16: note: in call to '&checker.context_->on_error(&"argument index out of range"[0])'
context_.on_error("argument index out of range");
^
{fmt} can be used as a safe portable replacement for ``itoa``: