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Load template

Warnings

Optimization

Verbose

Sprout

MessagePack

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About sponsors(Japanese)

created by

anonymous

2 minutes ago

​x
 
#include <iostream>
​
using namespace std;
​
​
template<int C>
struct Fixed
{
    static constexpr int Components = C;
    constexpr int components() const { return Components; }
};
struct Variable
{
    static constexpr int Components = 0;
    int c = 3;
    int components() const { return c; }
};
​
template<typename T>
void function(T &&t)
{
    if constexpr (T::Components <= 1)
    {
        if constexpr (!T::Components) if (t.components() != 1) goto con;
        cout << "1 component, fixed or not\n";
        goto fin;
    }
/*[[maybe_unused]]*/ con:     // here it is!

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$ g++ prog.cc -Wall -Wextra -std=c++17 -pedantic

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prog.cc: In instantiation of 'void function(T&&) [with T = Fixed<1>]':
prog.cc:37:24:   required from here
prog.cc:28:22: warning: label 'con' defined but not used [-Wunused-label]
   28 | /*[[maybe_unused]]*/ con:     // here it is!
      |                      ^~~

1 component, fixed or not
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