cxx11-constexpr.h

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// https://en.wikipedia.org/wiki/C%2B%2B11#constexpr_.E2.80.93_Generalized_constant_expressions
 
// #1
constexpr int get_five() {return 5;}
int some_value[get_five() + 7]; // Create an array of 12 integers. Legal C++11
 
// #2
constexpr double earth_gravitational_acceleration = 9.8;
constexpr double moon_gravitational_acceleration = earth_gravitational_acceleration / 6.0;
 
class ConstExprConstructorDeclaration {
    constexpr ConstExprConstructorDeclaration(QString &param);
};
 
class ConstExprConstructorDefinition {
    constexpr ConstExprConstructorDefinition(QString &param) {}
};
 
class ExplicitConstExprConstructorDeclaration {
    explicit constexpr ExplicitConstructorDeclaration(QString &param);
};
 
class ExplicitConstExprConstructorDefinition {
    explicit constexpr ExplicitConstructorDefinition(QString &param) {}
};