Is there a way to use operator+ to concatenate std::strings in c++? -

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• what difference between these 2 cases of adding string? 5 answers

i have function this

void foo (const char* mystring){ ... } 

and want use this

std::string tail = "something"; foo("my" + "string" + tail); 

but can't find easy way. sure can make string somewhere else , pass foo(). prefer find way inline, because foo() called several times in code, don't want make string each time. tried

foo(std::string ("my" + "string" + tail).c_str()) 

but can guess doesn't work.

"my"and "string" c style string literals, have odd rule concatenated if written without +.

so "my" "string" + tail work, , produce std::string. however, still not correct type function, unless use .c_str() on result.