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Catch invalid uses of fmt::arg

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This commit is contained in:
Victor Zverovich 2020-01-04 07:11:11 -10:00
parent cb8e7caf7c
commit a73d89e9c7
1 changed files with 6 additions and 9 deletions
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15
include/fmt/core.h
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@ -1396,7 +1396,10 @@ template <typename Char> struct named_arg_base {
}
};
template <typename T, typename Char> struct named_arg : named_arg_base<Char> {
struct view {};
template <typename T, typename Char>
struct named_arg : view, named_arg_base<Char> {
const T& value;
named_arg(basic_string_view<Char> name, const T& val)
@ -1414,7 +1417,6 @@ inline void check_format_string(const S&) {
template <typename..., typename S, FMT_ENABLE_IF(is_compile_string<S>::value)>
void check_format_string(S);
struct view {};
template <bool...> struct bool_pack;
template <bool... Args>
using all_true =
@ -1443,13 +1445,8 @@ typename buffer_context<Char>::iterator vformat_to(
/**
\rst
Returns a named argument to be used in a formatting function.
The named argument holds a reference and does not extend the lifetime
of its arguments.
Consequently, a dangling reference can accidentally be created.
The user should take care to only pass this function temporaries when
the named argument is itself a temporary, as per the following example.
Returns a named argument to be used in a formatting function. It should only
be used in a call to a formatting function.
**Example**::