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Add "explicit" keyword for several unary constructors.

We recommend to use explicit for unary constructors, but we are not using is in the following slides. Here, it is added in several places where the addition doesn't create space issues on the slide.

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talk/objectorientation
- constructors.tex

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`‎talk/objectorientation/constructors.tex`

Lines changed: 5 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -226,7 +226,7 @@`
`226`	`226`	`\begin{cppcode}`
`227`	`227`	`struct Delegate {`
`228`	`228`	`int m_i;`
`229`		`- Delegate(int i) : m_i(i) {`
	`229`	`+ explicit Delegate(int i) : m_i(i) {`
`230`	`230`	`... complex initialization ...`
`231`	`231`	`}`
`232`	`232`	`Delegate() : Delegate(42) {}`
`@@ -247,7 +247,7 @@`
`247`	`247`	`\begin{exampleblock}{Practically}`
`248`	`248`	`\begin{cppcode}`
`249`	`249`	`struct Base {`
`250`		`- Base(int a); // ctor 1`
	`250`	`+ explicit Base(int a); // ctor 1`
`251`	`251`	`};`
`252`	`252`	`struct Derived : Base {`
`253`	`253`	`using Base::Base;`
`@@ -270,9 +270,9 @@`
`270`	`270`	`\begin{exampleblock}{Practically}`
`271`	`271`	`\begin{cppcode}`
`272`	`272`	`struct Base {`
`273`		`- int a{5}; // also possible: int a = 5;`
`274`		`- Base() = default;`
`275`		`- Base(int _a) : a(_a) {}`
	`273`	`+ int a{5}; // or: int a = 5;`
	`274`	`+ Base() = default;`
	`275`	`+ explicit Base(int _a) : a(_a) {}`
`276`	`276`	`};`
`277`	`277`	`struct Derived : Base {`
`278`	`278`	`int b{6};`

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`‎talk/objectorientation/constructors.tex`

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