exceptions.hpp

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// Copyright (c) 2018--present, The Simons Foundation
// This file is part of TRIQS/nda and is licensed under the Apache License, Version 2.0.
// SPDX-License-Identifier: Apache-2.0
// See LICENSE in the root of this distribution for details.

 
#pragma once
 
#include "./macros.hpp"
 
#include <exception>
#include <sstream>
#include <string>
 
#define NDA_RUNTIME_ERROR throw nda::runtime_error{} << "Error at " << __FILE__ << " : " << __LINE__ << "\n\n"
 
#define NDA_ASSERT(X)                                                                                                                                \
  if (!(X)) NDA_RUNTIME_ERROR << AS_STRING(X);
 
#define NDA_ASSERT2(X, ...)                                                                                                                          \
  if (!(X)) NDA_RUNTIME_ERROR << AS_STRING(X) << "\n" << __VA_ARGS__;
 
namespace nda {

  class runtime_error : public std::exception {
    // Accumulator for the error message.
    std::stringstream acc;
 
    // Error message.
    mutable std::string _what;
 
    public:
    runtime_error() noexcept : std::exception() {}

    runtime_error(runtime_error const &err) noexcept : acc(err.acc.str()), _what(err._what) {}

    ~runtime_error() noexcept override = default;

    template <typename T>
    runtime_error &operator<<(T const &x) {
      acc << x;
      return *this;
    }

    runtime_error &operator<<(const char *mess) {
      (*this) << std::string(mess);
      return *this;
    }

    const char *what() const noexcept override {
      _what = acc.str();
      return _what.c_str();
    }
  };
 
} // namespace nda