如何使用 C++17 的 std::filesystem 获取 C++ 文件大小

最近版本的 C++ 具有内置的跨平台文件系统库，支持许多有用的操作如获取文件大小。

filesize_example.cpp

#include <filesystem>

// 使用示例：
std::filesystem::file_size("myfile.bin");

#include <filesystem>

// 使用示例：
std::filesystem::file_size("myfile.bin");

完整示例：

filesize_full.cpp

#include <filesystem>
#include <iostream>

int main() {
    std::uintmax_t filesize = std::filesystem::file_size("myfile.bin");
    std::cout << "Filesize in bytes is " << filesize << std::endl;
    return 0;
}

#include <filesystem>
#include <iostream>

int main() {
    std::uintmax_t filesize = std::filesystem::file_size("myfile.bin");
    std::cout << "Filesize in bytes is " << filesize << std::endl;
    return 0;
}

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