PETSc version 3.17.4
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# PetscMemcpy

Copies n bytes, beginning at location b, to the space beginning at location a. The two memory regions CANNOT overlap, use PetscMemmove() in that case.

### Synopsis

    static inline PetscErrorCode PetscMemcpy(void *a,const void *b,size_t n)

Not Collective

### Input Parameters

| b | - pointer to initial memory space
| n | - length (in bytes) of space to copy

### Output Parameter

| a | - pointer to copy space

### Compile Option

PETSC_PREFER_DCOPY_FOR_MEMCPY will cause the BLAS dcopy() routine to be used for memory copies on double precision values. PETSC_PREFER_COPY_FOR_MEMCPY will cause C code to be used for memory copies on double precision values. PETSC_PREFER_FORTRAN_FORMEMCPY will cause Fortran code to be used for memory copies on double precision values.

### Note

Prefer PetscArraycpy() This routine is analogous to memcpy(). Not available from Fortran

Developer Note: this is inlined for fastest performance

### See Also

PetscMemzero(), PetscMemcmp(), PetscArrayzero(), PetscArraycmp(), PetscArraycpy(), PetscMemmove(), PetscStrallocpy()

### Level

intermediate

### Location

include/petscsys.h

### Examples

src/ksp/ksp/tutorials/ex74.c.html
src/ts/tutorials/ex10.c.html
src/ts/tutorials/ex11.c.html
Index of all Sys routines
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Index of all manual pages