select_value.cpp

#include <cstdio>
#include <cstring>
#include <utility>

template<class T, size_t N>
static inline T select_value(
    std::pair<const char*, T> (&&table)[N], const char* name, T fallback)
{
    for (auto& kvp : table) {
        if (std::strcmp(kvp.first, name) == 0) {
            return kvp.second;
        }
    }
    return fallback;
}

int main(int argc, char **argv)
{
    int val = select_value({
        {"one", 1},
        {"two", 2},
        {"tree", 3},
        {"four", 4},
    }, "tree", 0);

    printf("%d\n", val);
}