Allocator::max_size support in basic_memory_buffer #1960
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Thanks for the PR but I don't think it's necessary because |
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If "size <= max_size && new_capacity > max_size" then exception thrown from allocate() will not be correctly. |
vitaut
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Oct 28, 2020
include/fmt/format.h
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| if (size > max_size) { | ||
| throw std::length_error("fmt::basic_memory_buffer::grow"); | ||
| } |
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Please remove this to reduce the number of checks.
include/fmt/format.h
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| if (new_capacity > max_size) new_capacity = max_size; | ||
| if (size > new_capacity) new_capacity = size; // size is never greater max_size. |
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We only need to check new_capacity if it is not greater than size. The rest allocate will take care of. Something like:
if (size > new_capacity) new_capacity = size;
else if (new_capacity > max_size) new_capacity = (std::max)(size, max_size);
phprus
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Commit updated. |
vitaut
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Oct 28, 2020
test/mock-allocator.h
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| template <typename Allocator, size_t MaxSize> | ||
| class allocator_max_size: public Allocator { | ||
| public: | ||
| typedef typename Allocator::value_type value_type; | ||
| size_t max_size() const FMT_NOEXCEPT { | ||
| return MaxSize; | ||
| } | ||
| value_type* allocate(size_t n) { | ||
| if (n > max_size()) { | ||
| throw std::length_error("size > max_size"); | ||
| } | ||
| return std::allocator_traits<Allocator>::allocate( | ||
| *static_cast<Allocator *>(this), n); | ||
| } | ||
| void deallocate(value_type* p, size_t n) { | ||
| std::allocator_traits<Allocator>::deallocate( | ||
| *static_cast<Allocator *>(this), p, n); | ||
| } | ||
| }; |
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Please move this to the format-test.cc since it's only used there and not a mock.
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vitaut
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Oct 29, 2020
test/format-test.cc
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| template <typename Allocator, size_t MaxSize> | ||
| class allocator_max_size: public Allocator { | ||
| public: | ||
| typedef typename Allocator::value_type value_type; |
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Here and below: typedef -> using
test/format-test.cc
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| } catch (const std::exception &) { | ||
| throws_on_resize = true; | ||
| } | ||
| EXPECT_EQ(throws_on_resize, false); |
test/format-test.cc
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| } catch (const std::exception &) { | ||
| throws_on_resize = true; | ||
| } | ||
| EXPECT_EQ(throws_on_resize, true); |
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Thank you! |
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The allocator may have a limit on the size of the allocated memory.
I agree that my contributions are licensed under the {fmt} license, and agree to future changes to the licensing.