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Allow zero components MultiFab and BaseFab #2873

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merged 1 commit into from
Jul 8, 2022
Merged

Allow zero components MultiFab and BaseFab #2873

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18 changes: 15 additions & 3 deletions Src/Base/AMReX_BaseFab.H
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Original file line number Diff line number Diff line change
Expand Up @@ -350,10 +350,22 @@ public:
* order, with the component index coming last. In other words,
* dataPtr returns a pointer to all the Nth components.
*/
T* dataPtr (int n = 0) noexcept { AMREX_ASSERT(!(this->dptr == 0)); return &(this->dptr[n*this->domain.numPts()]); }
T* dataPtr (int n = 0) noexcept {
if (this->dptr) {
return &(this->dptr[n*this->domain.numPts()]);
} else {
return nullptr;
}
}

//! Same as above except works on const FABs.
const T* dataPtr (int n = 0) const noexcept { AMREX_ASSERT(!(this->dptr == 0)); return &(this->dptr[n*this->domain.numPts()]); }
const T* dataPtr (int n = 0) const noexcept {
if (this->dptr) {
return &(this->dptr[n*this->domain.numPts()]);
} else {
return nullptr;
}
}

T* dataPtr (const IntVect& iv, int n = 0) noexcept;

Expand Down Expand Up @@ -1882,9 +1894,9 @@ BaseFab<T>::define ()
{
AMREX_ASSERT(this->dptr == 0);
AMREX_ASSERT(this->domain.numPts() > 0);
AMREX_ASSERT(std::numeric_limits<Long>::max()/this->nvar > this->domain.numPts());
AMREX_ASSERT(this->nvar >= 0);
if (this->nvar == 0) return;
AMREX_ASSERT(std::numeric_limits<Long>::max()/this->nvar > this->domain.numPts());

this->truesize = this->nvar*this->domain.numPts();
this->ptr_owner = true;
Expand Down