component/instance.hh

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#ifndef WASMTIME_COMPONENT_INSTANCE_HH
#define WASMTIME_COMPONENT_INSTANCE_HH
 
#include <wasmtime/conf.h>
 
#ifdef WASMTIME_FEATURE_COMPONENT_MODEL
 
#include <string_view>
#include <wasmtime/component/component.hh>
#include <wasmtime/component/func.hh>
#include <wasmtime/component/instance.h>
#include <wasmtime/store.hh>
 
namespace wasmtime {
namespace component {
 
class Instance {
  wasmtime_component_instance_t instance;
 
public:
  explicit Instance(const wasmtime_component_instance_t &inst)
      : instance(inst) {}
 
  std::optional<ExportIndex> get_export_index(Store::Context cx,
                                              const ExportIndex *instance,
                                              std::string_view name) const {
    wasmtime_component_export_index_t *ret =
        wasmtime_component_instance_get_export_index(
            &this->instance, cx.capi(), instance ? instance->capi() : nullptr,
            name.data(), name.size());
    if (ret == nullptr) {
      return std::nullopt;
    }
    return ExportIndex(ret);
  }
 
  std::optional<Func> get_func(Store::Context cx,
                               const ExportIndex &index) const {
    wasmtime_component_func_t ret;
    bool found = wasmtime_component_instance_get_func(&instance, cx.capi(),
                                                      index.capi(), &ret);
    if (!found)
      return std::nullopt;
    return Func(ret);
  }
 
  const wasmtime_component_instance_t *capi() const { return &instance; }
};
 
} // namespace component
} // namespace wasmtime
 
#endif // WASMTIME_FEATURE_COMPONENT_MODEL
 
#endif // WASMTIME_COMPONENT_INSTANCE_H