Range support #1953
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Range support #1953
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sarah-quinones
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Oct 25, 2020
include/fmt/ranges.h
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| # define FMT_DECLTYPE_RETURN(val) \ | ||
| ->decltype(val) { return val; } \ | ||
| static_assert(true, "a") |
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What is this static assert for?
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the static assert makes it so that a semi colon is required after the macro, which mostly just helps clang-format handle the code better. the "a" is to silence a clang-tidy warning to replace the statement with a unary static assert. mostly a habit of mine but i'm not sure if it's needed here
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include/fmt/core.h
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| @@ -1207,6 +1211,11 @@ template <typename Context> struct arg_mapper { | |||
| return 0; | |||
| } | |||
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| template <typename T, std::size_t N> | |||
| FMT_CONSTEXPR auto map(T const (&values)[N]) -> T const (&)[N] { | |||
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Thank you! |
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I agree that my contributions are licensed under the {fmt} license, and agree to future changes to the licensing.
this PR adds support for ranges when the
begin/endmembers are not const. this is done by copying the range, since in those cases the range is likely to be a view, so a copy is cheap. if we want to be more restrictive, we can instead only do so when the object isnothrow_copy_constructible.instead of using
begin/endmember functions, i've chosen to extend support for when they're found by argument dependent lookup, with a special case for C arrays. this is to be more consistent with the rest of the language, as the same is done for c++20 ranges and range-for loops.an alternative to copying the range would be to forward the arguments, rather than capturing them as
const&. but i'm not sure if that would be preferable.