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Check make_format_args's preconditions #3080

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Oct 12, 2022
Merged

Check make_format_args's preconditions #3080

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814411c
Check `make_format_args`'s preconditions
cpplearner Jul 27, 2022
1ab9067
Add Standardese citations.
StephanTLavavej Sep 23, 2022
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4 changes: 4 additions & 0 deletions stl/inc/format
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Original file line number Diff line number Diff line change
Expand Up @@ -3397,11 +3397,15 @@ using wformat_args = basic_format_args<wformat_context>;

template <class _Context = format_context, class... _Args>
_NODISCARD auto make_format_args(_Args&&... _Vals) {
static_assert((_Has_formatter<_Args, _Context> && ...),
"Cannot format an argument. To make type T formattable, provide a formatter<T> specialization.");
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return _Format_arg_store<_Context, _Args...>{_Vals...};
}

template <class... _Args>
_NODISCARD auto make_wformat_args(_Args&&... _Vals) {
static_assert((_Has_formatter<_Args, wformat_context> && ...),
"Cannot format an argument. To make type T formattable, provide a formatter<T> specialization.");
return _Format_arg_store<wformat_context, _Args...>{_Vals...};
}

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