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PIVector2D removeColumn memmove optimization

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Бычков Андрей
2026-02-27 01:49:30 +03:00
parent 14e62a41bd
commit 8a26b6174d
1 changed files with 12 additions and 5 deletions
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17
libs/main/containers/pivector2d.h
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@@ -1219,14 +1219,21 @@ public:
//! \sa removeRow(), PIVector::remove() //! \sa removeRow(), PIVector::remove()
inline PIVector2D<T> & removeColumn(size_t col) { inline PIVector2D<T> & removeColumn(size_t col) {
if (col >= cols_ || rows_ == 0) return *this; if (col >= cols_ || rows_ == 0) return *this;
PIVector2D<T> result(rows_, cols_ - 1);
for (size_t r = 0; r < rows_; ++r) { for (size_t r = 0; r < rows_; ++r) {
for (size_t c = 0, nc = 0; c < cols_; ++c) { T * dst = mat.data(r * (cols_ - 1));
if (c == col) continue; T * src = mat.data(r * cols_);
result.element(r, nc++) = element(r, c); if (col > 0) {
memmove(dst, src, col * sizeof(T));
dst += col;
src += col;
}
size_t remaining = (cols_ - 1) - col;
if (remaining > 0) {
memmove(dst, src + 1, remaining * sizeof(T));
} }
} }
swap(result); cols_--;
mat.resize(rows_ * cols_);
return *this; return *this;
} }