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Merge pull request #625 from GlassAndOneHalf/example-update

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Issue #624 ES.34 Add Example.
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Gabriel Dos Reis 2017-07-24 11:57:50 -07:00 committed by GitHub
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@ -10681,6 +10681,32 @@ Requires messy cast-and-macro-laden code to get working right.
}
**Alternative**: Overloading. Templates. Variadic templates.
#include <iostream>
void error(int severity)
{
std::cerr << std::endl;
std::exit(severity);
}
template <typename T, typename... Ts>
constexpr void error(int severity, T head, Ts... tail)
{
std::cerr << head;
error(severity, tail...);
}
void use()
{
error(7); // No crash!
error(5, "this", "is", "not", "an", "error"); // No crash!
std::string an = "an";
error(7, "this", "is", "not", an, "error"); // No crash!
error(5, "oh", "no", nullptr); // Compile error! No need for nullptr.
}
##### Note