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Compiler Error C2134

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'function' : call does not result in a constant expression

A function declared as constexpr can only call other functions declared as constexpr.

The following sample generates C2134:

// C2134.cpp
// compile with: /c
int A() {
    return 42;
};

constexpr int B() {
    return A();  // Error C2134: 'A': call does not result in a constant expression.
}

Possible resolution:

// C2134b.cpp
constexpr int A() {  // add constexpr to A, since it meets the requirements of constexpr.
    return 42;
};

constexpr int B() {
    return A();  // No error
}