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Print out the stored_value1 and stored_value2 for the lambda example. (#36)

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* Fix compilation error for structured binding

The header  <tuple> is missing. After adding it, it compiles fine with clang in c++17 mode.

* Print out the stored_value1 and stored_value2 for the lambda example.

To make it eaiser for the readers to understand the difference
between lambda capture by value and by reference.
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卖码翁
2018-06-23 03:24:10 -04:00
committed by Ou Changkun
parent e80a7120ef
commit a548ea79bd
1 changed files with 2 additions and 0 deletions
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code/3/3.1.cpp
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@@ -16,6 +16,7 @@ void learn_lambda_func_1() {
}; };
value_1 = 100; value_1 = 100;
auto stored_value_1 = copy_value_1(); auto stored_value_1 = copy_value_1();
std::cout << "stored_value_1=" << stored_value_1 << std::endl;
// 这时, stored_value_1 == 1, 而 value_1 == 100. // 这时, stored_value_1 == 1, 而 value_1 == 100.
// 因为 copy_value_1 在创建时就保存了一份 value_1 的拷贝 // 因为 copy_value_1 在创建时就保存了一份 value_1 的拷贝
} }
@@ -27,6 +28,7 @@ void learn_lambda_func_2() {
}; };
value_2 = 100; value_2 = 100;
auto stored_value_2 = copy_value_2(); auto stored_value_2 = copy_value_2();
std::cout << "stored_value_2=" << stored_value_2 << std::endl;
// 这时, stored_value_2 == 100, value_1 == 100. // 这时, stored_value_2 == 100, value_1 == 100.
// 因为 copy_value_2 保存的是引用 // 因为 copy_value_2 保存的是引用
} }