I need to concatenate a variable number of string literals into one to use it in static_assert()
I tried using templates with structs, but compiler does not like literals as template parameters.
error: the address of ‘m1’ is not a valid template argument because it does not have static storage duration. error: ‘"thre"’ is not a valid template argument for type ‘const char*’ because string literals can never be used in this context I also tried perfect forwarding, but I get an error: ‘args#0’ is not a constant expression
template<size_t size> constexpr size_t const_strssize(const char (&)[size]) { return size; } template<class... Ts> constexpr size_t const_strssize(Ts&&... args) { return const_sum<(const_strssize(std::forward<const Ts>(args)), ...)>::get; } Just to clarify, I cannot do "string1" "string2" because some of the strings I get from functions returns.
Please, do not advise stuff like strlen or memcpy. I know, they can be calculated at compile time.
