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add resizeVector and export at C level #7810

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add resizeVector and export at C level #7810

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1 change: 1 addition & 0 deletions src/data.table.h
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Original file line number Diff line number Diff line change
Expand Up @@ -308,6 +308,7 @@ SEXP memcpyDT(SEXP dest, SEXP src, SEXP offset, SEXP size);
SEXP memcpyVectoradaptive(SEXP dest, SEXP src, SEXP offset, SEXP size);
SEXP memcpyDTadaptive(SEXP dest, SEXP src, SEXP offset, SEXP size);
SEXP copyAsGrowable(SEXP x);
SEXP resizeVector(SEXP x, SEXP size);

// nafill.c
void nafillDouble(double *x, uint_fast64_t nx, unsigned int type, double fill, bool nan_is_na, ans_t *ans, bool verbose);
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6 changes: 6 additions & 0 deletions src/frollapply.c
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Expand Up @@ -87,3 +87,9 @@ SEXP copyAsGrowable(SEXP x) {
UNPROTECT(1);
return ret;
}

SEXP resizeVector(SEXP x, SEXP size) {
R_xlen_t newlen = INTEGER_RO(size)[0];

@ben-schwen ben-schwen Jul 10, 2026

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Need some input validation for size or newlen

.Call(CresizeVector, x, -1L)
# Warning message:
# printing of extremely long output is truncated
.Call(CresizeVector, x, NA_integer_)
# Warning message:
# printing of extremely long output is truncated

are problematic

R_resizeVector(x, newlen);
return x;
}
1 change: 1 addition & 0 deletions src/init.c
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Expand Up @@ -161,6 +161,7 @@ static const R_CallMethodDef callMethods[] = {
{"CmemcpyVectoradaptive", (DL_FUNC)&memcpyVectoradaptive, -1},
{"CmemcpyDTadaptive", (DL_FUNC)&memcpyDTadaptive, -1},
{"CcopyAsGrowable", (DL_FUNC)&copyAsGrowable, -1},
{"CresizeVector", (DL_FUNC)&resizeVector, -1},
{"Cfrolladapt", (DL_FUNC)&frolladapt, -1},
{"Cis_direct_child", (DL_FUNC)&is_direct_child, -1},
{NULL, NULL, 0}};
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