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book: formatting style updates (#231)

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ReEcho
2022-07-17 19:29:30 +08:00
committed by GitHub
parent 41b88c861e
commit e50e3c64f2
10 changed files with 104 additions and 74 deletions
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12
book/en-us/03-runtime.md
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@@ -221,8 +221,8 @@ int foo(int a, int b, int c) {
;
}
int main() {
// bind parameter 1, 2 on function foo, and use std::placeholders::_1 as placeholder
// for the first parameter.
// bind parameter 1, 2 on function foo,
// and use std::placeholders::_1 as placeholder for the first parameter.
auto bindFoo = std::bind(foo, std::placeholders::_1, 1,2);
// when call bindFoo, we only need one param left
bindFoo(1);
@@ -355,7 +355,8 @@ int main()
std::string&& rv1 = std::move(lv1); // legal, std::move can convert lvalue to rvalue
std::cout << rv1 << std::endl; // string,
const std::string& lv2 = lv1 + lv1; // legal, const lvalue reference can extend temp variable's lifecycle
const std::string& lv2 = lv1 + lv1; // legal, const lvalue reference can
// extend temp variable's lifecycle
// lv2 += "Test"; // illegal, const ref can't be modified
std::cout << lv2 << std::endl; // string,string,
@@ -482,8 +483,9 @@ int main() {
// "str: Hello world."
std::cout << "str: " << str << std::endl;
// use push_back(const T&&), no copy
// the string will be moved to vector, and therefore std::move can reduce copy cost
// use push_back(const T&&),
// no copy the string will be moved to vector,
// and therefore std::move can reduce copy cost
v.push_back(std::move(str));
// str is empty now
std::cout << "str: " << str << std::endl;