explicit specifier
De cppreference.com
<metanoindex/>
Especifica construtores e operadores de conversão (desde C++11) que não permitem conversões implícitas
Original:
Specifies constructors and (desde C++11) conversion operators that don't allow implicit conversions
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Sintaxe
Exemplo
struct A
{
A ( int ) {}
operator int() const { return 0; }
};
struct B
{
explicit B(int) {}
explicit operator int() const { return 0; }
};
int main()
{
// A is has no explicit ctor / conversion, everything is fine
A a1 = 1;
A a2 ( 2 );
A a3 { 3 };
int na1 = a1;
int na2 = static_cast<int>( a1 );
B b1 = 1; // Error: implicit conversion from int to B
B b2 ( 2 ); // OK: explicit constructor call
B b3 { 3 }; // OK: explicit constructor call
int nb1 = b2; // Error: implicit conversion from B to int
int nb2 = static_cast<int>( b2 ); // OK: explicit cast
}