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This article mainly explains "how C++ generates formatted standard strings". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn how C++ generates formatted standard strings.

Two methods of formatting string

As we all know, C++ 's std::string function is incomplete, and there are no various functions, such as formatting string function.

In python3, two methods of formatting strings are supported, one is C style, the formatting part begins with%, the specific type after%% (for example,% s corresponds to string% d corresponds to integer), the other is type-independent style, {0} corresponds to the first parameter, {1} corresponds to the second parameter.

> "{0}'s age is {1}" .format ("scarlet", 11) "scarlet's age is 11" > "% s's age is% d"% ("scarlet", 11) "scarlet's age is 11"

On the other hand, in C++, we can only use C function to format a buffer with snprintf.

# define BUFFSIZE 512 char buf [BUFFSIZE]; snprintf (buf, BUFFSIZE, "% s's age is% d\ n", "scarlet", 11)

Or use type-independent flow operators

Std::ostringstream os; os

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