NumCpp  2.12.1
A Templatized Header Only C++ Implementation of the Python NumPy Library
fromfile.hpp
Go to the documentation of this file.
1
28#pragma once
29
30#include <filesystem>
31#include <fstream>
32#include <memory>
33#include <sstream>
34#include <string>
35
38#include "NumCpp/Core/Types.hpp"
40#include "NumCpp/NdArray.hpp"
41
42namespace nc
43{
44 //============================================================================
45 // Method Description:
53 template<typename dtype>
54 NdArray<dtype> fromfile(const std::string& inFilename)
55 {
56 if (!std::filesystem::exists(inFilename))
57 {
58 THROW_INVALID_ARGUMENT_ERROR("input filename does not exist.\n\t" + inFilename);
59 }
60
61 // read in as binary file
62 std::ifstream file(inFilename.c_str(), std::ios::in | std::ios::binary);
63 if (!file.is_open())
64 {
65 THROW_INVALID_ARGUMENT_ERROR("unable to open file\n\t" + inFilename);
66 }
67
68 file.seekg(0, std::ifstream::end);
69 const uint32 fileSize = static_cast<uint32>(file.tellg());
70 file.seekg(0, std::ifstream::beg);
71
72 std::vector<char> fileBuffer;
73 fileBuffer.reserve(fileSize);
74 file.read(fileBuffer.data(), fileSize);
75
76 if (file.bad() || file.fail())
77 {
78 THROW_INVALID_ARGUMENT_ERROR("error occured while reading the file");
79 }
80
81 file.close();
82
83 NdArray<dtype> returnArray(reinterpret_cast<dtype*>(fileBuffer.data()), fileSize / sizeof(dtype));
84
85 return returnArray;
86 }
87
88 //============================================================================
89 // Method Description:
98 template<typename dtype>
99 NdArray<dtype> fromfile(const std::string& inFilename, const char inSep)
100 {
101 std::ifstream file(inFilename.c_str());
102 if (!file.is_open())
103 {
104 THROW_INVALID_ARGUMENT_ERROR("unable to open file\n\t" + inFilename);
105 }
106
107 std::stringstream buffer;
108 buffer << file.rdbuf();
109 file.close();
110
111 return fromstring<dtype>(buffer.str(), inSep);
112 }
113} // namespace nc
#define THROW_INVALID_ARGUMENT_ERROR(msg)
Definition: Error.hpp:37
Holds 1D and 2D arrays, the main work horse of the NumCpp library.
Definition: NdArrayCore.hpp:139
Definition: Cartesian.hpp:40
NdArray< dtype > fromfile(const std::string &inFilename)
Definition: fromfile.hpp:54
std::uint32_t uint32
Definition: Types.hpp:40