C++ params类代码示例

    // Copy vector from builtin backend.
    static boost::shared_ptr<vector>
    copy_vector(typename builtin<real>::vector const &x, const params &prm)
    {
        precondition(!prm.context().empty(), "Empty VexCL context!");

        return boost::make_shared<vector>(prm.context(), x);
    }

//////////////////////////////////////////////////////////////////
// fastuidraw::gl::GlyphAtlasGL methods
fastuidraw::gl::GlyphAtlasGL::
GlyphAtlasGL(const params &P):
  GlyphAtlas(TexelStoreGL::create(P.texel_store_dimensions(), P.delayed()),
             GeometryStoreGL::create(P.number_floats(), P.delayed(), P.alignment()))
{
  m_d = FASTUIDRAWnew GlyphAtlasGLPrivate(P);
}

    // Create vector of the specified size.
    static boost::shared_ptr<vector>
    create_vector(size_t size, const params &prm)
    {
        precondition(!prm.context().empty(), "Empty VexCL context!");

        return boost::make_shared<vector>(prm.context(), size);
    }

    wrapper(size_t n, params prm = params(),
            const backend_params &bprm = backend_params(),
            const InnerProduct &inner_product = InnerProduct()
            )
        : s(prm.get("type", runtime::solver::bicgstab)), handle(0)
    {
        if (!prm.erase("type")) AMGCL_PARAM_MISSING("type");

        switch(s) {

#define AMGCL_RUNTIME_SOLVER(type) \
            case type: \
                handle = static_cast<void*>(new amgcl::solver::type<Backend, InnerProduct>(n, prm, bprm, inner_product)); \
                break

            AMGCL_RUNTIME_SOLVER(cg);
            AMGCL_RUNTIME_SOLVER(bicgstab);
            AMGCL_RUNTIME_SOLVER(bicgstabl);
            AMGCL_RUNTIME_SOLVER(gmres);
            AMGCL_RUNTIME_SOLVER(lgmres);
            AMGCL_RUNTIME_SOLVER(fgmres);
            AMGCL_RUNTIME_SOLVER(idrs);

#undef AMGCL_RUNTIME_SOLVER

            default:
                throw std::invalid_argument("Unsupported solver type");
        }
    }

int ctable_factory_base::setup(int dfd, const char * name, const params & config, dtype::ctype key_type)
{
	istr base;
	params base_config;
	if(!config.get("base", &base) || !config.get("base_config", &base_config))
		return NULL;
	return setup(base, dfd, name, base_config, key_type);
}

params loadParams(const std::string& filename, params& p) {
  CSVInput input(filename);
  CSVHeader header(filename);

  p.setInput(input);
  p.setHeader(header);
  return p;
}

    lemon_interface(const params &p) {
      state_ = ::ParseAlloc(&pooled::tracked_byte_alloc);
      if (p.trace()) {
#if NERVE_TRACE_PARSER
        ::ParseTrace(stdout, detail::parse_trace_prefix);
#endif
      }
      context_ = p.context();
    }

int exist_dtable::create(int dfd, const char * file, const params & config, dtable::iter * source, const ktable * shadow)
{
	int e_dfd, r;
	params base_config, dnebase_config;
	const dtable_factory * base = dtable_factory::lookup(config, "base");
	const dtable_factory * dnebase = dtable_factory::lookup(config, "dnebase");
	if(!base || !dnebase)
		return -ENOENT;
	if(!config.get("base_config", &base_config, params()))
		return -EINVAL;
	if(!config.get("dnebase_config", &dnebase_config, params()))
		return -EINVAL;
	
	if(!source_shadow_ok(source, shadow))
		return -EINVAL;
	
	r = mkdirat(dfd, file, 0755);
	if(r < 0)
		return r;
	e_dfd = openat(dfd, file, O_RDONLY);
	if(e_dfd < 0)
		goto fail_open;
	
	/* just to be sure */
	source->first();
	{
		dtable_skip_iter<dne_skip_test> base_source(source);
		r = base->create(e_dfd, "base", base_config, &base_source, NULL);
		if(r < 0)
			goto fail_base;
	}
	
	source->first();
	{
		full_ktable full_shadow(source);
		nonshadow_skip_test skip_test(shadow);
		dtable_skip_iter<nonshadow_skip_test> dnebase_source(source, skip_test);
		r = dnebase->create(e_dfd, "dnebase", dnebase_config, &dnebase_source, &full_shadow);
		if(r < 0)
			goto fail_dnebase;
	}
	
	close(e_dfd);
	return 0;
	
fail_dnebase:
	util::rm_r(e_dfd, "base");
fail_base:
	close(e_dfd);
fail_open:
	unlinkat(dfd, file, AT_REMOVEDIR);
	return (r < 0) ? r : -1;
}

int deltaint_dtable::init(int dfd, const char * file, const params & config, sys_journal * sysj)
{
	const dtable_factory * base_factory;
	const dtable_factory * ref_factory;
	params base_config, ref_config;
	int di_dfd;
	if(base)
		deinit();
	base_factory = dtable_factory::lookup(config, "base");
	ref_factory = dtable_factory::lookup(config, "ref");
	if(!base_factory || !ref_factory)
		return -ENOENT;
	if(!config.get("base_config", &base_config, params()))
		return -EINVAL;
	if(!config.get("ref_config", &ref_config, params()))
		return -EINVAL;
	di_dfd = openat(dfd, file, O_RDONLY);
	if(di_dfd < 0)
		return di_dfd;
	base = base_factory->open(di_dfd, "base", base_config, sysj);
	if(!base)
		goto fail_base;
	reference = ref_factory->open(di_dfd, "ref", ref_config, sysj);
	if(!reference)
		goto fail_reference;
	ktype = base->key_type();
	cmp_name = base->get_cmp_name();
	
	assert(ktype == reference->key_type());
	
	scan_iter = base->iterator();
	if(!scan_iter)
		goto fail_scan;
	ref_iter = reference->iterator();
	if(!ref_iter)
		goto fail_iter;
	
	close(di_dfd);
	return 0;
	
fail_iter:
	delete scan_iter;
	scan_iter = NULL;
fail_scan:
	reference->destroy();
	reference = NULL;
fail_reference:
	base->destroy();
	base = NULL;
fail_base:
	close(di_dfd);
	return -1;
}

    // Copy matrix from builtin backend.
    static boost::shared_ptr<matrix>
    copy_matrix(boost::shared_ptr< typename builtin<real>::matrix > A, const params &prm)
    {
        precondition(!prm.context().empty(), "Empty VexCL context!");

        const typename builtin<real>::matrix &a = *A;

        BOOST_AUTO(Aptr, a.ptr_data());
        BOOST_AUTO(Acol, a.col_data());
        BOOST_AUTO(Aval, a.val_data());

        return boost::make_shared<matrix>(prm.context(), rows(*A), cols(*A), Aptr, Acol, Aval);
    }

 amg(
         const Matrix &A,
         const params &prm = params(),
         const backend_params &backend_prm = backend_params()
    )
   : coarsening(prm.get("coarsening.type", runtime::coarsening::smoothed_aggregation)),
     relaxation(prm.get("relaxation.type", runtime::relaxation::spai0)),
     handle(0)
 {
     runtime::detail::process_amg<Backend>(
             coarsening, relaxation,
             runtime::detail::amg_create<Backend, Matrix>(handle, A, prm, backend_prm)
             );
 }

int exception_dtable::init(int dfd, const char * file, const params & config, sys_journal * sysj)
{
	const dtable_factory * base_factory;
	const dtable_factory * alt_factory;
	params base_config, alt_config;
	int excp_dfd;
	if(base || alt)
		deinit();
	base_factory = dtable_factory::lookup(config, "base");
	alt_factory = dtable_factory::lookup(config, "alt");
	if(!base_factory || !alt_factory)
		return -EINVAL;
	if(!config.get("base_config", &base_config, params()))
		return -EINVAL;
	if(!config.get("alt_config", &alt_config, params()))
		return -EINVAL;
	if(!config.get_blob_or_string("reject_value", &reject_value))
		return -EINVAL;
	/* the reject value must exist, because nonexistent values
	 * can get pruned out if the shadow does not require them */
	if(!reject_value.exists())
		return -EINVAL;
	excp_dfd = openat(dfd, file, O_RDONLY);
	if(excp_dfd < 0)
		return excp_dfd;
	base = base_factory->open(excp_dfd, "base", base_config, sysj);
	if(!base)
		goto fail_base;
	alt = alt_factory->open(excp_dfd, "alt", alt_config, sysj);
	if(!alt)
		goto fail_alt;
	ktype = base->key_type();
	if(ktype != alt->key_type())
		goto fail_ktype;
	cmp_name = base->get_cmp_name();
	
	close(excp_dfd);
	return 0;
	
fail_ktype:
	alt->destroy();
	alt = NULL;
fail_alt:
	base->destroy();
	base = NULL;
fail_base:
	close(excp_dfd);
	return -1;
}

inline void read(const FileNode& node, params &x, const params & default_value = params())
{
    if(node.empty())
        x = default_value;
    else
        x.read(node);
}

int btree_dtable::init(int dfd, const char * file, const params & config, sys_journal * sysj)
{
	const dtable_factory * factory;
	params base_config;
	int r, bt_dfd;
	if(base)
		deinit();
	factory = dtable_factory::lookup(config, "base");
	if(!factory)
		return -ENOENT;
	if(!config.get("base_config", &base_config, params()))
		return -EINVAL;
	if(!factory->indexed_access(base_config))
		return -ENOSYS;
	bt_dfd = openat(dfd, file, O_RDONLY);
	if(bt_dfd < 0)
		return bt_dfd;
	base = factory->open(bt_dfd, "base", base_config, sysj);
	if(!base)
		goto fail_base;
	ktype = base->key_type();
	assert(ktype == dtype::UINT32);
	cmp_name = base->get_cmp_name();
	
	/* open the btree */
	btree = rofile::open<BTREE_PAGE_KB, 8>(bt_dfd, "btree");
	if(!btree)
		goto fail_open;
	r = btree->read_type(0, &header);
	if(r < 0)
		goto fail_format;
	/* check the header */
	if(header.magic != BTREE_DTABLE_MAGIC || header.version != BTREE_DTABLE_VERSION)
		goto fail_format;
	if(header.page_size != BTREE_PAGE_SIZE || header.pageno_size != BTREE_PAGENO_SIZE)
		goto fail_format;
	if(header.key_size != BTREE_KEY_SIZE || header.index_size != BTREE_INDEX_SIZE)
		goto fail_format;
	/* 1 -> uint32, and even with an empty table there will be a root page */
	if(header.key_type != 1 || !header.root_page)
		goto fail_format;
	
	close(bt_dfd);
	return 0;
	
fail_format:
	delete btree;
fail_open:
	base->destroy();
	base = NULL;
fail_base:
	close(bt_dfd);
	return -1;
}

int simple_stable::create(int dfd, const char * name, const params & config, dtype::ctype key_type)
{
	int md_dfd, r;
	params meta_config, data_config;
	const dtable_factory * meta = dtable_factory::lookup(config, "meta");
	const ctable_factory * data = ctable_factory::lookup(config, "data");
	if(!meta || !data)
		return -ENOENT;
	if(!config.get("meta_config", &meta_config, params()))
		return -EINVAL;
	if(!config.get("data_config", &data_config, params()))
		return -EINVAL;
	r = mkdirat(dfd, name, 0755);
	if(r < 0)
		return r;
	md_dfd = openat(dfd, name, O_RDONLY);
	if(md_dfd < 0)
	{
		r = md_dfd;
		goto fail_open;
	}
	
	/* the metadata is keyed by named properties (strings) */
	r = meta->create(md_dfd, "st_meta", meta_config, dtype::STRING);
	if(r < 0)
		goto fail_meta;
	r = data->create(md_dfd, "st_data", data_config, key_type);
	if(r < 0)
		goto fail_data;
	
	close(md_dfd);
	return 0;
	
fail_data:
	util::rm_r(md_dfd, "st_meta");
fail_meta:
	close(md_dfd);
fail_open:
	unlinkat(dfd, name, AT_REMOVEDIR);
	return r;
}