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Fix clang -Wsign-conversion warning in bigint::subtract_bigits.

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subtract_bigits's index parameter is only passed to basic_memory_buffer::operator[] (size_t).

subtract_bigits is only called from subtract_aligned, which passes it 'i' for the index.

subtract_aligned initialises 'i' to 'other.exp_ - exp_', after asserting that other.exp_ >= exp_. As such the result of this subtraction must always be positive, and so can safely be cast to a size_t.

As 'i' is only ever incremented after its assignment it too can be a size_t.
This commit is contained in:
Dair Grant 2020-03-02 14:20:50 +00:00
parent 1e8493196e
commit 55e0fe7e05
1 changed files with 2 additions and 2 deletions
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4
include/fmt/format-inl.h
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@ -508,7 +508,7 @@ class bigint {
friend struct formatter<bigint>;
void subtract_bigits(int index, bigit other, bigit& borrow) {
void subtract_bigits(size_t index, bigit other, bigit& borrow) {
auto result = static_cast<double_bigit>(bigits_[index]) - other - borrow;
bigits_[index] = static_cast<bigit>(result);
borrow = static_cast<bigit>(result >> (bigit_bits * 2 - 1));
@ -525,7 +525,7 @@ class bigint {
FMT_ASSERT(other.exp_ >= exp_, "unaligned bigints");
FMT_ASSERT(compare(*this, other) >= 0, "");
bigit borrow = 0;
int i = other.exp_ - exp_;
size_t i = size_t(other.exp_ - exp_);
for (size_t j = 0, n = other.bigits_.size(); j != n;
++i, ++j) {
subtract_bigits(i, other.bigits_[j], borrow);