HRESULT XGameSaveEnumerateContainerInfoByName(  
         XGameSaveProviderHandle provider,  
         const char* containerNamePrefix,  
         void* context,  
         XGameSaveContainerInfoCallback* callback  
)  

// Enumerate Container List by prefix, if no prefix is supplied it is 
// the same as calling XGameSaveEnumerateContainerInfo. 
// NOTE: this should be safe to call from a time critical thread 
// but the we are at the mercy of the callback. 
void Sample::_EnumerateContainerInfoByName(const char* prefix) 
{ 
    HRESULT hr = XGameSaveEnumerateContainerInfoByName(_provider, prefix, this, 
        [](const XGameSaveContainerInfo* container, void* context) 
    { 
        auto self = reinterpret_cast<Sample*>(context); 
        self->_UpdateContainerList(container); 
        return true; 
    }); 
    if (FAILED(hr)) 
    { 
        _HandleContainerErrors(prefix, hr); 
    } 
  
}