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FILE I/O: PAST, PRESENT AND FUTURE CPPCON OCTOBER 3RD 2023 GUY DAVIDSON @HATCAT01INTRODUCTIONS • Head of Engineering Practice at Creative Assembly • 1980 – Acorn Atom • ISO/IEC JTC1/SC22/WG21 • BSI Why do we have files? • What is a filesystem? • Why should we avoid buffered file IO? • How do we optimise unbuffered file IO? • How might the standard help us in future?AGENDA • Sub-megabyte days • More RAM, more disk capacity • Moving data into and out of RAM • File IO in C++ from fstream to the OS SDK • The 64-bit address spaceSUB-MEGABYTE DAYS • Why do we have files?SUB- MEGABYTE DAYSSUB-

contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 1.11 Virtual machine configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 1.12 Removing virtual machines . . Advanced configuration for Windows guests . . . . . . . . . . . . . . . . . . . . 156 9.3.1 Automated Windows system preparation . . . . . . . . . . . . . . . . . 156 9.4 Advanced configuration for Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 9.7 Advanced display configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 9.7.1 Custom VESA resolutions . . .

contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 1.12 Virtual machine configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 1.13 Removing virtual machines . . 2 Automated Linux/Unix guest logons . . . . . . . . . . . . . . . . . . . . 196 9.3 Advanced configuration for Windows guests . . . . . . . . . . . . . . . . . . . . 199 5 Contents 9.3.1 Automated Windows Windows system preparation . . . . . . . . . . . . . . . . . 199 9.4 Advanced configuration for Linux and Solaris guests . . . . . . . . . . . . . . . . 200 9.4.1 Manual setup of selected guest services

contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 1.12 Virtual machine configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 1.13 Removing virtual machines . . 2 Automated Linux/Unix guest logons . . . . . . . . . . . . . . . . . . . . 195 9.3 Advanced configuration for Windows guests . . . . . . . . . . . . . . . . . . . . 198 9.3.1 Automated Windows system system preparation . . . . . . . . . . . . . . . . . 198 5 Contents 9.4 Advanced configuration for Linux and Solaris guests . . . . . . . . . . . . . . . . 199 9.4.1 Manual setup of selected guest services

contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 1.11 Virtual machine configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 1.12 Removing virtual machines . . Advanced configuration for Windows guests . . . . . . . . . . . . . . . . . . . . 164 9.3.1 Automated Windows system preparation . . . . . . . . . . . . . . . . . 164 9.4 Advanced configuration for Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 9.8 Advanced display configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 9.8.1 Custom VESA resolutions . . .

contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 1.10 Virtual machine configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 1.11 Removing virtual machines . . Advanced configuration for Windows guests . . . . . . . . . . . . . . . . . . . . 147 9.3.1 Automated Windows system preparation . . . . . . . . . . . . . . . . . 147 9.4 Advanced configuration for Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 9.7 Advanced display configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 9.7.1 Custom VESA resolutions . . .