arrays: h5 read/write for arrays of complex types

- array of complex type (not fundamental) can now be saved/loaded to
  h5
- with a test with array<gf<...>>

test/triqs/gfs/array_gf.cpp

@@ -0,0 +1,40 @@
+#include <triqs/gfs.hpp>
+#define TEST(X) std::cout << BOOST_PP_STRINGIZE((X)) << " ---> " << (X) << std::endl << std::endl;
+
+using namespace triqs::gfs;
+using namespace triqs::arrays;
+
+int main(int argc, char* argv[]) {
+
+ try {
+
+  triqs::clef::placeholder<0> w_;
+  auto agf = array<gf<imfreq>, 2>{2, 3};
+  auto bgf = array<gf<imfreq>, 2>{2, 3};
+  agf() = gf<imfreq>{{10.0, Fermion}, {1, 1}};
+  agf(0, 0)(w_) << 1 / (w_ + 2);
+
+  array<double,2> A(2,2); A()=0;A(0,0) = 1.3; A(1,1) = -8.2;
+  array<array<double,2>, 1> aa(2), bb;
+  aa(0) = A;
+  aa(1) = 2 * A;
+  bb = aa;
+  
+  { 
+   H5::H5File file("ess_array_gf.h5", H5F_ACC_TRUNC);
+   h5_write(file, "Agf", agf);
+   h5_write(file, "aa", aa);
+  }
+  {
+   H5::H5File file("ess_array_gf.h5", H5F_ACC_RDONLY);
+   h5_read(file, "Agf", bgf);
+   h5_read(file, "aa", bb);
+  }
+  {
+   H5::H5File file("ess_array_gf2.h5", H5F_ACC_TRUNC);
+   h5_write(file, "Agf", bgf);
+   h5_write(file, "aa", bb);
+  }
+ }
+ TRIQS_CATCH_AND_ABORT;
+}

test/triqs/parameters/param.cpp

@@ -92,7 +92,7 @@ int main() {
   C = extract<decltype(C)>(P["B"]);
   std::cout  << "C" << C << std::endl;
 
-  array<array<int,2>, 1> aa(3);
+  array<array<int,2>, 1> aa(2);
   aa(0) = A; aa(1) = 2*A;
   P["aa"] = aa;
 
@@ -143,6 +143,7 @@ int main() {
 
   parameters P4;
   parameters::register_type<triqs::arrays::array<double,1>>();
+  //parameters::register_type<triqs::arrays::array<int,2>>();
   std::cout << "P4 before : "<< P4<< std::endl ;
   {
    H5::H5File file( "ess.h5", H5F_ACC_RDONLY );

triqs/arrays/h5/simple_read_write.hpp

@@ -147,7 +147,7 @@ namespace arrays {
    V = res;
   }
 
- } // namespace h5impl
+ } // namespace h5_impl
 
  // a trait to detect if A::value_type exists and is a scalar or a string
  // used to exclude array<array<..>>
@@ -192,8 +192,89 @@ namespace arrays {
  template <typename ArrayType>
  ENABLE_IFC(is_amv_value_or_view_class<ArrayType>::value&& has_scalar_or_string_value_type<ArrayType>::value)
      h5_write(h5::group g, std::string const& name, ArrayType const& A) {
+  if (A.is_empty()) TRIQS_RUNTIME_ERROR << " Can not save an empty array into hdf5";
   h5_impl::write_array(g, name, array_const_view<typename ArrayType::value_type, ArrayType::rank>(A));
  }
+
+ // details for generic save/read of arrays.
+ namespace h5_impl {
+  inline std::string _h5_name() { return ""; }
+
+  template <typename T0, typename... Ts> std::string _h5_name(T0 const& t0, Ts const&... ts) {
+   auto r = std::to_string(t0);
+   auto r1 = _h5_name(ts...);
+   if (r1 != "") r += "_" + r1;
+   return r;
+  }
+
+#ifndef __cpp_generic_lambdas
+  template <typename ArrayType> struct _save_lambda {
+   ArrayType const& a;
+   h5::group g;
+   template <typename... Is> void operator()(Is const&... is) const { h5_write(g, _h5_name(is...), a(is...)); }
+  };
+
+  template <typename ArrayType> struct _load_lambda {
+   ArrayType& a;
+   h5::group g;
+   template <typename... Is> void operator()(Is const&... is) { h5_read(g, _h5_name(is...), a(is...)); }
+  };
+#endif
+ } // details
+ 
+ /*
+   * Write an array or a view into an hdf5 file when type is not fundamental
+   * ArrayType The type of the array/matrix/vector, etc..
+   * g The h5 group
+   * name The name of the hdf5 array in the file/group where the stack will be stored
+   * A The array to be stored
+   * The HDF5 exceptions will be caught and rethrown as TRIQS_RUNTIME_ERROR (with a full stackstrace, cf triqs doc).
+   */
+ template <typename ArrayType>
+ std::c14::enable_if_t<is_amv_value_or_view_class<ArrayType>::value && !has_scalar_or_string_value_type<ArrayType>::value>
+ h5_write(h5::group gr, std::string name, ArrayType const& a) {
+  if (a.is_empty()) TRIQS_RUNTIME_ERROR << " Can not save an empty array into hdf5";
+  auto gr2 = gr.create_group(name);
+  gr2.write_triqs_hdf5_data_scheme(a);
+  // save the shape
+  array<int, 1> sha(ArrayType::rank);
+  for (int u = 0; u < ArrayType::rank; ++u) sha(u) = a.shape()[u];
+  h5_write(gr2, "shape", sha);
+#ifndef __cpp_generic_lambdas
+  foreach(a, h5_impl::_save_lambda<ArrayType>{a, gr2});
+#else
+  foreach(a, [&](auto... is) { h5_write(gr2, h5_impl::_h5_name(is...), a(is...)); });
+#endif
+ }
+
+ /*
+   * Read an array or a view from an hdf5 file when type is not fundamental
+   * ArrayType The type of the array/matrix/vector, etc..
+   * g The h5 group
+   * name The name of the hdf5 array in the file/group where the stack will be stored
+   * A The array to be stored
+   * The HDF5 exceptions will be caught and rethrown as TRIQS_RUNTIME_ERROR (with a full stackstrace, cf triqs doc).
+   */
+ template <typename ArrayType>
+ std::c14::enable_if_t<is_amv_value_or_view_class<ArrayType>::value && !has_scalar_or_string_value_type<ArrayType>::value>
+ h5_read(h5::group gr, std::string name, ArrayType& a) {
+  static_assert(!std::is_const<ArrayType>::value, "Can not read in const object");
+  auto gr2 = gr.open_group(name);
+  // TODO checking scheme...
+  // load the shape
+  auto sha2 = a.shape();
+  array<int, 1> sha;
+  h5_read(gr2, "shape", sha);
+  if (first_dim(sha) != sha2.size())
+   TRIQS_RUNTIME_ERROR << " array<array<...>> load : rank mismatch. Expected " << sha2.size()<< " Got " << first_dim(sha);
+  for (int u = 0; u < sha2.size(); ++u) sha2[u] = sha(u);
+  if (a.shape() != sha2) a.resize(sha2);
+#ifndef __cpp_generic_lambdas
+  foreach(a, h5_impl::_load_lambda<ArrayType>{a, gr2});
+#else
+  foreach(a, [&](auto... is) { h5_read(gr2, h5_impl::_h5_name(is...), a(is...)); });
+#endif
+ }
 }
 }
 #endif

triqs/parameters/opaque_object_h5.cpp

@@ -48,7 +48,8 @@ namespace triqs { namespace utility {
      size_t type_hash_element = type_hash;
      auto it2= _object::code_element_rank_to_code_array.find(std::make_pair(type_hash_element,rank));
      if (it2 == _object::code_element_rank_to_code_array.end())
-      TRIQS_RUNTIME_ERROR << " code_element_rank_to_code_array : type not found" << rank;
+      TRIQS_RUNTIME_ERROR << " code_element_rank_to_code_array : type not found : " << name << "  " << type_hash_element << " "
+                          << rank;
      type_hash = it2->second;
     }
    }

triqs/utility/mini_vector.hpp

@@ -69,6 +69,8 @@ namespace triqs { namespace utility {
 
    friend void swap(mini_vector & a, mini_vector & b) { std::swap(a._data, b._data);}
 
+   int size() const { return Rank;}
+
    template<typename T2>
    mini_vector & operator=(const mini_vector<T2,Rank> & x){ for (int i=0;i<Rank; ++i) _data[i] = x[i]; return *this;}