#include <memory> does not exist in the apple clang. Since we declared the compile environment:

> clang++ -v
Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Target: x86_64-apple-darwin18.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

It is better to not do this change. See https://changkun.de/modern-cpp/zh-cn/01-intro/index.html

modern-cpp-tutorial/book/zh-cn$ echo "
#include <iostream>
#include <utility>
int main() {
    auto important = std::make_unique<int>(1);
    auto add = [v1 = 1, v2 = std::move(important)](int x, int y) -> int {
        return x + y + v1 + (*v2);
    };
    std::cout << add(3, 4) << std::endl;
    return 0;
}" | clang++-10 -std=c++14 -x c++ - -o mytest
<stdin>:5:27: error: no member named 'make_unique' in namespace 'std'
    auto important = std::make_unique<int>(1);
                     ~~~~~^
<stdin>:5:42: error: expected '(' for function-style cast or type construction
    auto important = std::make_unique<int>(1);
                                      ~~~^
<stdin>:7:31: error: use of undeclared identifier 'v2'
        return x + y + v1 + (*v2);
                              ^
3 errors generated.

modern-cpp-tutorial/book/zh-cn$ echo "
#include <iostream>
#include <memory>
int main() {
    auto important = std::make_unique<int>(1);
    auto add = [v1 = 1, v2 = std::move(important)](int x, int y) -> int {
        return x + y + v1 + (*v2);
    };
    std::cout << add(3, 4) << std::endl;
    return 0;
}" | clang++-10 -std=c++14 -x c++ - -o mytest
modern-cpp-tutorial/book/zh-cn$

Interesting, perhaps the issue was already fixed. Thanks for the clarification.

Could you please also fix the code in book/en-us/03-runtime.md and code in code/3?